| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49315: drivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drivers: staging: rtl8192e: Fix deadlock in rtllib_beacons_stop() |
| |
| There is a deadlock in rtllib_beacons_stop(), which is shown |
| below: |
| |
| (Thread 1) | (Thread 2) |
| | rtllib_send_beacon() |
| rtllib_beacons_stop() | mod_timer() |
| spin_lock_irqsave() //(1) | (wait a time) |
| ... | rtllib_send_beacon_cb() |
| del_timer_sync() | spin_lock_irqsave() //(2) |
| (wait timer to stop) | ... |
| |
| We hold ieee->beacon_lock in position (1) of thread 1 and |
| use del_timer_sync() to wait timer to stop, but timer handler |
| also need ieee->beacon_lock in position (2) of thread 2. |
| As a result, rtllib_beacons_stop() will block forever. |
| |
| This patch extracts del_timer_sync() from the protection of |
| spin_lock_irqsave(), which could let timer handler to obtain |
| the needed lock. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49315 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.318 with commit 4681129fda9e8555392eaaadb239ec6a6e2b3e12 |
| Fixed in 4.14.283 with commit 381045dc64d23a2229c47c5524c06bfc33d34446 |
| Fixed in 4.19.247 with commit 08bacf871c019163ccd1389d0bc957a43324967a |
| Fixed in 5.4.198 with commit 64b05fa212c7e4d057676e8b7e7120c6eb2f615b |
| Fixed in 5.10.122 with commit 0f69d7d5e918aa43423d86bd17ddb11b1b5e8ada |
| Fixed in 5.15.47 with commit fef451f0fbbe85dbd2962b18379d02e2965610db |
| Fixed in 5.17.15 with commit 46c861009bf437a18417df24cea0d181741b7d72 |
| Fixed in 5.18.4 with commit ffd4c4d5293e4985092ea45ba21cad9326e2e434 |
| Fixed in 5.19 with commit 9b6bdbd9337de3917945847bde262a34a87a6303 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49315 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/staging/rtl8192e/rtllib_softmac.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/4681129fda9e8555392eaaadb239ec6a6e2b3e12 |
| https://git.kernel.org/stable/c/381045dc64d23a2229c47c5524c06bfc33d34446 |
| https://git.kernel.org/stable/c/08bacf871c019163ccd1389d0bc957a43324967a |
| https://git.kernel.org/stable/c/64b05fa212c7e4d057676e8b7e7120c6eb2f615b |
| https://git.kernel.org/stable/c/0f69d7d5e918aa43423d86bd17ddb11b1b5e8ada |
| https://git.kernel.org/stable/c/fef451f0fbbe85dbd2962b18379d02e2965610db |
| https://git.kernel.org/stable/c/46c861009bf437a18417df24cea0d181741b7d72 |
| https://git.kernel.org/stable/c/ffd4c4d5293e4985092ea45ba21cad9326e2e434 |
| https://git.kernel.org/stable/c/9b6bdbd9337de3917945847bde262a34a87a6303 |
