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Change History

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix a potential use-after-free in bpf_link_free()

After commit 1a80dbcb2dba, bpf_link can be freed by
link->ops->dealloc_deferred, but the code still tests and uses
link->ops->dealloc afterward, which leads to a use-after-free as
reported by syzbot. Actually, one of them should be sufficient, so
just call one of them instead of both. Also add a WARN_ON() in case
of any problematic implementation.

kernel.org https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a [No types assigned]

kernel.org https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209 [No types assigned]

kernel.org https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382 [No types assigned]