{"api_version":"1","generated_at":"2026-08-08T04:36:50+00:00","cve":"CVE-2023-53485","urls":{"html":"https://cve.report/CVE-2023-53485","api":"https://cve.report/api/cve/CVE-2023-53485.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-53485","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-53485"},"summary":{"title":"fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev\n\nSyzkaller reported the following issue:\n\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:1965:6\nindex -84 is out of range for type 's8[341]' (aka 'signed char[341]')\nCPU: 1 PID: 4995 Comm: syz-executor146 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106\n ubsan_epilogue lib/ubsan.c:217 [inline]\n __ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348\n dbAllocDmapLev+0x3e5/0x430 fs/jfs/jfs_dmap.c:1965\n dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1809\n dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1350\n dbAlloc+0x658/0xca0 fs/jfs/jfs_dmap.c:874\n dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]\n dtInsert+0xda7/0x6b00 fs/jfs/jfs_dtree.c:863\n jfs_create+0x7b6/0xbb0 fs/jfs/namei.c:137\n lookup_open fs/namei.c:3492 [inline]\n open_last_lookups fs/namei.c:3560 [inline]\n path_openat+0x13df/0x3170 fs/namei.c:3788\n do_filp_open+0x234/0x490 fs/namei.c:3818\n do_sys_openat2+0x13f/0x500 fs/open.c:1356\n do_sys_open fs/open.c:1372 [inline]\n __do_sys_openat fs/open.c:1388 [inline]\n __se_sys_openat fs/open.c:1383 [inline]\n __x64_sys_openat+0x247/0x290 fs/open.c:1383\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x7f1f4e33f7e9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007ffc21129578 EFLAGS: 00000246 ORIG_RAX: 0000000000000101\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f4e33f7e9\nRDX: 000000000000275a RSI: 0000000020000040 RDI: 00000000ffffff9c\nRBP: 00007f1f4e2ff080 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007f1f4e2ff110\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n </TASK>\n\nThe bug occurs when the dbAllocDmapLev()function attempts to access\ndp->tree.stree[leafidx + LEAFIND] while the leafidx value is negative.\n\nTo rectify this, the patch introduces a safeguard within the\ndbAllocDmapLev() function. A check has been added to verify if leafidx is\nnegative. If it is, the function immediately returns an I/O error, preventing\nany further execution that could potentially cause harm.\n\nTested via syzbot.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-10-01 12:15:51","updated_at":"2026-08-04 10:19:08"},"problem_types":["CWE-129"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/f2af019091f904ca08b3572ab0111238ad6d17b3","name":"https://git.kernel.org/stable/c/f2af019091f904ca08b3572ab0111238ad6d17b3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bdf07ab1595b613b03f32dbb5cb379edfa1a7334","name":"https://git.kernel.org/stable/c/bdf07ab1595b613b03f32dbb5cb379edfa1a7334","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/911b48eec45152822bccf45cd3563b48256b1520","name":"https://git.kernel.org/stable/c/911b48eec45152822bccf45cd3563b48256b1520","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6e7d9d76e5654bcdd3cdb7c9441a8113428ecebb","name":"https://git.kernel.org/stable/c/6e7d9d76e5654bcdd3cdb7c9441a8113428ecebb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/39f6292d75959e8accac0b3e24090094ba0824e9","name":"https://git.kernel.org/stable/c/39f6292d75959e8accac0b3e24090094ba0824e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0d9e678a82915633b99603f744e7735d1a673d72","name":"https://git.kernel.org/stable/c/0d9e678a82915633b99603f744e7735d1a673d72","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/53b0a362aca2583729e8ca2936ca657ff3247d88","name":"https://git.kernel.org/stable/c/53b0a362aca2583729e8ca2936ca657ff3247d88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4e302336d5ca1767a06beee7596a72d3bdc8d983","name":"https://git.kernel.org/stable/c/4e302336d5ca1767a06beee7596a72d3bdc8d983","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-53485","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53485","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 0d9e678a82915633b99603f744e7735d1a673d72 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 53b0a362aca2583729e8ca2936ca657ff3247d88 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 6e7d9d76e5654bcdd3cdb7c9441a8113428ecebb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 911b48eec45152822bccf45cd3563b48256b1520 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 39f6292d75959e8accac0b3e24090094ba0824e9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 bdf07ab1595b613b03f32dbb5cb379edfa1a7334 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 f2af019091f904ca08b3572ab0111238ad6d17b3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 4e302336d5ca1767a06beee7596a72d3bdc8d983 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.14.324 4.14.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19.293 4.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.255 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.192 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.123 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.42 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.4.7 6.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.5 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"53485","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/jfs/jfs_dmap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0d9e678a82915633b99603f744e7735d1a673d72","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"53b0a362aca2583729e8ca2936ca657ff3247d88","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"6e7d9d76e5654bcdd3cdb7c9441a8113428ecebb","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"911b48eec45152822bccf45cd3563b48256b1520","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"39f6292d75959e8accac0b3e24090094ba0824e9","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"bdf07ab1595b613b03f32dbb5cb379edfa1a7334","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"f2af019091f904ca08b3572ab0111238ad6d17b3","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"4e302336d5ca1767a06beee7596a72d3bdc8d983","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/jfs/jfs_dmap.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.12"},{"lessThan":"2.6.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"4.14.*","status":"unaffected","version":"4.14.324","versionType":"semver"},{"lessThanOrEqual":"4.19.*","status":"unaffected","version":"4.19.293","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.255","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.192","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.123","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.42","versionType":"semver"},{"lessThanOrEqual":"6.4.*","status":"unaffected","version":"6.4.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.5","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.14.324","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.19.293","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.255","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.192","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.123","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.42","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.4.7","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.5","versionStartIncluding":"2.6.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev\n\nSyzkaller reported the following issue:\n\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:1965:6\nindex -84 is out of range for type 's8[341]' (aka 'signed char[341]')\nCPU: 1 PID: 4995 Comm: syz-executor146 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106\n ubsan_epilogue lib/ubsan.c:217 [inline]\n __ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348\n dbAllocDmapLev+0x3e5/0x430 fs/jfs/jfs_dmap.c:1965\n dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1809\n dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1350\n dbAlloc+0x658/0xca0 fs/jfs/jfs_dmap.c:874\n dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]\n dtInsert+0xda7/0x6b00 fs/jfs/jfs_dtree.c:863\n jfs_create+0x7b6/0xbb0 fs/jfs/namei.c:137\n lookup_open fs/namei.c:3492 [inline]\n open_last_lookups fs/namei.c:3560 [inline]\n path_openat+0x13df/0x3170 fs/namei.c:3788\n do_filp_open+0x234/0x490 fs/namei.c:3818\n do_sys_openat2+0x13f/0x500 fs/open.c:1356\n do_sys_open fs/open.c:1372 [inline]\n __do_sys_openat fs/open.c:1388 [inline]\n __se_sys_openat fs/open.c:1383 [inline]\n __x64_sys_openat+0x247/0x290 fs/open.c:1383\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x7f1f4e33f7e9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007ffc21129578 EFLAGS: 00000246 ORIG_RAX: 0000000000000101\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f4e33f7e9\nRDX: 000000000000275a RSI: 0000000020000040 RDI: 00000000ffffff9c\nRBP: 00007f1f4e2ff080 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007f1f4e2ff110\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n </TASK>\n\nThe bug occurs when the dbAllocDmapLev()function attempts to access\ndp->tree.stree[leafidx + LEAFIND] while the leafidx value is negative.\n\nTo rectify this, the patch introduces a safeguard within the\ndbAllocDmapLev() function. A check has been added to verify if leafidx is\nnegative. If it is, the function immediately returns an I/O error, preventing\nany further execution that could potentially cause harm.\n\nTested via syzbot."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:14:53.281Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0d9e678a82915633b99603f744e7735d1a673d72"},{"url":"https://git.kernel.org/stable/c/53b0a362aca2583729e8ca2936ca657ff3247d88"},{"url":"https://git.kernel.org/stable/c/6e7d9d76e5654bcdd3cdb7c9441a8113428ecebb"},{"url":"https://git.kernel.org/stable/c/911b48eec45152822bccf45cd3563b48256b1520"},{"url":"https://git.kernel.org/stable/c/39f6292d75959e8accac0b3e24090094ba0824e9"},{"url":"https://git.kernel.org/stable/c/bdf07ab1595b613b03f32dbb5cb379edfa1a7334"},{"url":"https://git.kernel.org/stable/c/f2af019091f904ca08b3572ab0111238ad6d17b3"},{"url":"https://git.kernel.org/stable/c/4e302336d5ca1767a06beee7596a72d3bdc8d983"}],"title":"fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2023-53485","datePublished":"2025-10-01T11:42:53.337Z","dateReserved":"2025-10-01T11:39:39.402Z","dateUpdated":"2026-08-04T09:14:53.281Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-10-01 12:15:51","lastModifiedDate":"2026-08-04 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jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev","CVE":"CVE-2023-53485","Year":"2023"},"notes":[{"CveYear":"2023","CveId":"53485","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev\n\nSyzkaller reported the following issue:\n\nUBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:1965:6\nindex -84 is out of range for type 's8[341]' (aka 'signed char[341]')\nCPU: 1 PID: 4995 Comm: syz-executor146 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106\n ubsan_epilogue lib/ubsan.c:217 [inline]\n __ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348\n dbAllocDmapLev+0x3e5/0x430 fs/jfs/jfs_dmap.c:1965\n dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1809\n dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1350\n dbAlloc+0x658/0xca0 fs/jfs/jfs_dmap.c:874\n dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]\n dtInsert+0xda7/0x6b00 fs/jfs/jfs_dtree.c:863\n jfs_create+0x7b6/0xbb0 fs/jfs/namei.c:137\n lookup_open fs/namei.c:3492 [inline]\n open_last_lookups fs/namei.c:3560 [inline]\n path_openat+0x13df/0x3170 fs/namei.c:3788\n do_filp_open+0x234/0x490 fs/namei.c:3818\n do_sys_openat2+0x13f/0x500 fs/open.c:1356\n do_sys_open fs/open.c:1372 [inline]\n __do_sys_openat fs/open.c:1388 [inline]\n __se_sys_openat fs/open.c:1383 [inline]\n __x64_sys_openat+0x247/0x290 fs/open.c:1383\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x7f1f4e33f7e9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007ffc21129578 EFLAGS: 00000246 ORIG_RAX: 0000000000000101\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1f4e33f7e9\nRDX: 000000000000275a RSI: 0000000020000040 RDI: 00000000ffffff9c\nRBP: 00007f1f4e2ff080 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007f1f4e2ff110\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n </TASK>\n\nThe bug occurs when the dbAllocDmapLev()function attempts to access\ndp->tree.stree[leafidx + LEAFIND] while the leafidx value is negative.\n\nTo rectify this, the patch introduces a safeguard within the\ndbAllocDmapLev() function. A check has been added to verify if leafidx is\nnegative. If it is, the function immediately returns an I/O error, preventing\nany further execution that could potentially cause harm.\n\nTested via syzbot.","Type":"Description","Title":"fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev"}]}}}