dmaengine: sf-pdma: Add multithread support for a DMA channel

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-50145
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-18 11:15:44 UTC
Updated2026-08-04 10:18:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: Add multithread support for a DMA channel When we get a DMA channel and try to use it in multiple threads it will cause oops and hanging the system. % echo 64 > /sys/module/dmatest/parameters/threads_per_chan % echo 10000 > /sys/module/dmatest/parameters/iterations % echo 1 > /sys/module/dmatest/parameters/run [ 89.480664] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a0 [ 89.488725] Oops [#1] [ 89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted 5.17.0-rc5 [ 89.509385] epc : vchan_find_desc+0x32/0x46 [ 89.513553] ra : sf_pdma_tx_status+0xca/0xd6 This happens because of data race. Each thread rewrite channels's descriptor as soon as device_prep_dma_memcpy() is called. It leads to the situation when the driver thinks that it uses right descriptor that actually is freed or substituted for other one. With current fixes a descriptor changes its value only when it has been used. A new descriptor is acquired from vc->desc_issued queue that is already filled with descriptors that are ready to be sent. Threads have no direct access to DMA channel descriptor. Now it is just possible to queue a descriptor for further processing.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6973886ad58e6b4988813331abb76ae0b364a9c2 b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11 git Not specified
CNA Linux Linux affected 6973886ad58e6b4988813331abb76ae0b364a9c2 5ab2782c944e324008ef5d658f2494a9f0e3c5ac git Not specified
CNA Linux Linux affected 6973886ad58e6b4988813331abb76ae0b364a9c2 4c7350b1dd8a192af844de32fc99b9e34c876fda git Not specified
CNA Linux Linux affected 6973886ad58e6b4988813331abb76ae0b364a9c2 a93b3f1e11971a91b6441b6d47488f4492cc113f git Not specified
CNA Linux Linux affected 6973886ad58e6b4988813331abb76ae0b364a9c2 b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 5.10.137 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.61 5.15.* semver Not specified
CNA Linux Linux unaffected 5.18.18 5.18.* semver Not specified
CNA Linux Linux unaffected 5.19.2 5.19.* semver Not specified
CNA Linux Linux unaffected 6.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5ab2782c944e324008ef5d658f2494a9f0e3c5ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a93b3f1e11971a91b6441b6d47488f4492cc113f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4c7350b1dd8a192af844de32fc99b9e34c876fda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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