Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind. Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free. Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).
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
ddf8abd2599491cbad959c700b90ba72a5dce8d0 to < facf353c9e8d7885b686d9a4b173d4e0af6441d2affectedddf8abd2599491cbad959c700b90ba72a5dce8d0 to < e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4affectedddf8abd2599491cbad959c700b90ba72a5dce8d0 to < a8d40942df074f4ebcb9bd3413596d92f323b064affectedddf8abd2599491cbad959c700b90ba72a5dce8d0 to < 6dd9ea05534f323668db94fcc2726c7a84547e78affectedddf8abd2599491cbad959c700b90ba72a5dce8d0 to < ae8e136bcaae96163b5821984de1036efc9abb1aaffectedddf8abd2599491cbad959c700b90ba72a5dce8d0 to < 6aee197b7fbcd61596a78b47d553f2f99111f217affectedddf8abd2599491cbad959c700b90ba72a5dce8d0 to < 6a19da111057f69214b97c62fb0ac59023970850affected
Linux Linux
Default version status: affected
2.6.35affected0 to < 2.6.35unaffected4.14.305 to ≤ 4.14.*unaffected4.19.272 to ≤ 4.19.*unaffected5.4.231 to ≤ 5.4.*unaffected5.10.166 to ≤ 5.10.*unaffected5.15.91 to ≤ 5.15.*unaffected6.1.9 to ≤ 6.1.*unaffected6.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2 ↗
- https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4 ↗
- https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064 ↗
- https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78 ↗
- https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a ↗
- https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217 ↗
- https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850 ↗