greybus: gb-beagleplay: fix sleep in atomic context in hdlc_tx_frames()

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Summary

CVECVE-2026-46041
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:23 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: greybus: gb-beagleplay: fix sleep in atomic context in hdlc_tx_frames() hdlc_append() calls usleep_range() to wait for circular buffer space, but it is called with tx_producer_lock (a spinlock) held via hdlc_tx_frames() -> hdlc_append_tx_frame()/hdlc_append_tx_u8()/etc. Sleeping while holding a spinlock is illegal and can trigger "BUG: scheduling while atomic". Fix this by moving the buffer-space wait out of hdlc_append() and into hdlc_tx_frames(), before the spinlock is acquired. The new flow: 1. Pre-calculate the worst-case encoded frame length. 2. Wait (with sleep) outside the lock until enough space is available, kicking the TX consumer work to drain the buffer. 3. Acquire the spinlock, re-verify space, and write the entire frame atomically. This ensures that sleeping only happens without any lock held, and that frames are either fully enqueued or not written at all. This bug is found by CodeQL static analysis tool (interprocedural sleep-in-atomic query) and my code review.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ec558bbfea671ac020a6dc6be8bf8f0ee556cce0 9f2b87bcdfed55145acbf932dc12f2c057145cad git Not specified
CNA Linux Linux affected ec558bbfea671ac020a6dc6be8bf8f0ee556cce0 b2801647c203a38e013802e9e9616b5bfac64968 git Not specified
CNA Linux Linux affected ec558bbfea671ac020a6dc6be8bf8f0ee556cce0 51667fe2d9294d66e0228b9f51d1f01b6680a641 git Not specified
CNA Linux Linux affected ec558bbfea671ac020a6dc6be8bf8f0ee556cce0 6b526dca0966f2370835765019a54319b78fca8d git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/51667fe2d9294d66e0228b9f51d1f01b6680a641 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9f2b87bcdfed55145acbf932dc12f2c057145cad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b2801647c203a38e013802e9e9616b5bfac64968 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b526dca0966f2370835765019a54319b78fca8d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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