CVE-2026-43189media: v4l2-async: Fix error handling on steps after finding a match

Official description

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-async: Fix error handling on steps after finding a match Once an async connection is found to be matching with an fwnode, a sub-device may be registered (in case it wasn't already), its bound operation is called, ancillary links are created, the async connection is added to the sub-device's list of connections and removed from the global waiting connection list. Further on, the sub-device's possible own notifier is searched for possible additional matches. Fix these specific issues: - If v4l2_async_match_notify() failed before the sub-notifier handling, the async connection was unbound and its entry removed from the sub-device's async connection list. The latter part was also done in v4l2_async_match_notify(). - The async connection's sd field was only set after creating ancillary links in v4l2_async_match_notify(). It was however dereferenced in v4l2_async_unbind_subdev_one(), which was called on error path of v4l2_async_match_notify() failure.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/30aaed311f973f13ba13a0cd2dc0202f595fff48
• https://git.kernel.org/stable/c/461733d83e67ba7e3a5b750c0d203f738e01244f
• https://git.kernel.org/stable/c/b02bcb378efa8af07827f49b3afcc5e825318c55
• https://git.kernel.org/stable/c/2de0a3c8148fc3dbea21981e6569f550b3626119
• https://git.kernel.org/stable/c/7345d6d356336c448d6b9230ed8704f39679fd12