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| author | Cong Wang <cong.wang@bytedance.com> | 2024-06-02 11:27:03 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2024-06-03 18:16:19 +0200 |
| commit | 2884dc7d08d98a89d8d65121524bb7533183a63a (patch) | |
| tree | 2ba0a318481cbdc9dd240af512fc8563635c3354 /net/unix/af_unix.c | |
| parent | 2317dc2c22cc353b699c7d1db47b2fe91f54055c (diff) | |
| download | linux-stable-2884dc7d08d98a89d8d65121524bb7533183a63a.tar.gz linux-stable-2884dc7d08d98a89d8d65121524bb7533183a63a.tar.bz2 linux-stable-2884dc7d08d98a89d8d65121524bb7533183a63a.zip | |
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.
Fixes: 1a80dbcb2dba ("bpf: support deferring bpf_link dealloc to after RCU grace period")
Reported-by: syzbot+1989ee16d94720836244@syzkaller.appspotmail.com
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20240602182703.207276-1-xiyou.wangcong@gmail.com
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions