Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: clear CALLBACK_RUNNING on failed delegation recall queue nfsd_break_one_deleg() sets NFSD4_CALLBACK_RUNNING via test_and_set_bit at entry to serialize recall work, then calls nfsd4_run_cb() to queue the recall. When the queue attempt fails the refcount bump is undone, but the RUNNING bit is left set. The only site that clears the bit is nfsd41_destroy_cb() (fs/nfsd/nfs4callback.c), which runs from the workqueue and is therefore unreachable when nothing was queued. The bit becomes a permanent latch on dp->dl_recall.cb_flags: every subsequent break_lease() on the same delegation hits the early-return guard in nfsd_break_one_deleg() and silently skips the recall, so the delegation is never broken and the conflicting open or lock stalls. Fix by clearing NFSD4_CALLBACK_RUNNING on the !queued branch alongside the refcount_dec.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1054e8ffc5c492f341bdf1888b882f1d163dd3d8 to < b137930ee52e3ef38915a3511d4c070463b63a32affected1054e8ffc5c492f341bdf1888b882f1d163dd3d8 to < cb2d0c4d1b3d301d042ed61365eaa8cb0141a254affected1054e8ffc5c492f341bdf1888b882f1d163dd3d8 to < b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96affected
Linux Linux
Default version status: affected
6.15affected0 to < 6.15unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected