bpf: sockmap missing NULL psock check

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Add psock NULL check to handle a racing sock event that can get the
sk_callback_lock before this case but after xchg happens causing the
refcnt to hit zero and sock user data (psock) to be null and queued
for garbage collection.

Also add a comment in the code because this is a bit subtle and
not obvious in my opinion.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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John Fastabend 2018-01-04 20:02:09 -08:00 • committed by Daniel Borkmann

parent 5133550296

commit 5731a879d0

1 changed files with 9 additions and 2 deletions

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kernel/bpf/sockmap.c

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