Description
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix circular locking dependency in nci_close_device nci_close_device() flushes rx_wq and tx_wq while holding req_lock. This causes a circular locking dependency because nci_rx_work() running on rx_wq can end up taking req_lock too: nci_rx_work -> nci_rx_data_packet -> nci_data_exchange_complete -> __sk_destruct -> rawsock_destruct -> nfc_deactivate_target -> nci_deactivate_target -> nci_request -> mutex_lock(&ndev->req_lock) Move the flush of rx_wq after req_lock has been released. This should safe (I think) because NCI_UP has already been cleared and the transport is closed, so the work will see it and return -ENETDOWN. NIPA has been hitting this running the nci selftest with a debug kernel on roughly 4% of the runs.
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
6a2968aaf50c7a22fced77a5e24aa636281efca8 to < 7ed00a3edc8597fe2333f524401e2889aa1b5edfaffected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < 5eef9ebec7f5738f12cadede3545c05b34bf5ac3affected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < ca54e904a071aa65ef3ad46ba42d51aaac6b73b4affected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < eb435d150ca74b4d40f77f1a2266f3636ed64a79affected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < 1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289affected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < d89b74bf08f067b55c03d7f999ba0a0e73177eb3affected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < 09143c0e8f3b03517e6233aad42f45c794d8df8eaffected6a2968aaf50c7a22fced77a5e24aa636281efca8 to < 4527025d440ce84bf56e75ce1df2e84cb8178616affected
Linux Linux
Default version status: affected
3.2affected0 to < 3.2unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.168 to ≤ 6.1.*unaffected6.6.131 to ≤ 6.6.*unaffected6.12.80 to ≤ 6.12.*unaffected6.18.21 to ≤ 6.18.*unaffected6.19.11 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf ↗
- https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3 ↗
- https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4 ↗
- https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79 ↗
- https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289 ↗
- https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3 ↗
- https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e ↗
- https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616 ↗