PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask()
Summary
PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask()
Original description
The description as published by the source.
In the Linux kernel, the following vulnerability has been resolved:
PM: sleep: Drop spurious WARN_ON() from pm_restore_gfp_mask()
Commit 35e4a69b2003f ("PM: sleep: Allow pm_restrict_gfp_mask()
stacking") introduced refcount-based GFP mask management that warns
when pm_restore_gfp_mask() is called with saved_gfp_count == 0.
Some hibernation paths call pm_restore_gfp_mask() defensively where
the GFP mask may or may not be restricted depending on the execution
path. For example, the uswsusp interface invokes it in
SNAPSHOT_CREATE_IMAGE, SNAPSHOT_UNFREEZE, and snapshot_release().
Before the stacking change this was a silent no-op; it now triggers
a spurious WARNING.
Remove the WARN_ON() wrapper from the !saved_gfp_count check while
retaining the check itself, so that defensive calls remain harmless
without producing false warnings.
[ rjw: Subject tweak ]
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-31567 linux-lts Fixed in: 6.18.35-r1
- Debian DEBIAN-CVE-2026-31567 linux Fixed in: 6.19.11-1
- Ubuntu UBUNTU-CVE-2026-31567 linux-hwe-edge
References
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org