Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: PCI: Fix pci_slot_trylock() error handling Commit a4e772898f8b ("PCI: Add missing bridge lock to pci_bus_lock()") delegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in pci_slot_trylock(), but it forgets to remove the corresponding pci_dev_unlock() when pci_bus_trylock() fails. Before a4e772898f8b, the code did: if (!pci_dev_trylock(dev)) /* <- lock bridge device */ goto unlock; if (dev->subordinate) { if (!pci_bus_trylock(dev->subordinate)) { pci_dev_unlock(dev); /* <- unlock bridge device */ goto unlock; } } After a4e772898f8b the bridge-device lock is no longer taken, but the pci_dev_unlock(dev) on the failure path was left in place, leading to the bug. This yields one of two errors: 1. A warning that the lock is being unlocked when no one holds it. 2. An incorrect unlock of a lock that belongs to another thread. Fix it by removing the now-redundant pci_dev_unlock(dev) on the failure path. [Same patch later posted by Keith at https://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e2355d513b89a2cb511b4ded0deb426cdb01acd0 before ebb27b7399ab8b9eb1f792b329aa5f6250c590d4; affected 04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945 before fbe06a3058114bf95a17a4941b205f4b321c6f0a; affected 7253b4fed46471cc247c6cacefac890a8472c083 before 943ed56606a7ab2fe5a99cad572dd17d484310c7; affected 78c6e39fef5c428960aff742149bba302dd46f5a before a19b61fdb958ffadbba85b43c991eb9fc70c1c1c; affected a4e772898f8bf2e7e1cf661a12c60a5612c4afab before 0425aaf20b407d2f2cf3bf469808e4a35f9abb8b; affected a4e772898f8bf2e7e1cf661a12c60a5612c4afab before bd435f4b738130d732ef64e0e57e45185f77165d; affected a4e772898f8bf2e7e1cf661a12c60a5612c4afab before 8b08ea9690b212b7bf7f12414039259cf34b1aa0; affected a4e772898f8bf2e7e1cf661a12c60a5612c4afab before 9368d1ee62829b08aa31836b3ca003803caf0b72; affected 0790b89c7e911003b8c50ae50e3ac7645de1fae9; affected df77a678c33871a6e4ac5b54a71662f1d702335b; affected 81c68e218ab883dfa368460a59b674084c0240da; affected 5.10.226 before 5.10.252; affected 5.15.167 before 5.15.202; affected 6.1.110 before 6.1.165; affected 6.6.51 before 6.6.128; affected 4.19.322 before 4.20; affected 5.4.284 before 5.5; affected 6.10.10 before 6.11 |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ebb27b7399ab8b9eb1f792b329aa5f6250c590d4
- https://git.kernel.org/stable/c/fbe06a3058114bf95a17a4941b205f4b321c6f0a
- https://git.kernel.org/stable/c/943ed56606a7ab2fe5a99cad572dd17d484310c7
- https://git.kernel.org/stable/c/a19b61fdb958ffadbba85b43c991eb9fc70c1c1c
- https://git.kernel.org/stable/c/0425aaf20b407d2f2cf3bf469808e4a35f9abb8b
- https://git.kernel.org/stable/c/bd435f4b738130d732ef64e0e57e45185f77165d
- https://git.kernel.org/stable/c/8b08ea9690b212b7bf7f12414039259cf34b1aa0
- https://git.kernel.org/stable/c/9368d1ee62829b08aa31836b3ca003803caf0b72
ADP enrichment
No English description supplied.
No references supplied.