bpf: Deref map in BPF_PROG_BIND_MAP when it's already used

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We are missing a deref for the case when we are doing BPF_PROG_BIND_MAP
on a map that's being already held by the program.
There is 'if (ret) bpf_map_put(map)' below which doesn't trigger
because we don't consider this an error.
Let's add missing bpf_map_put() for this specific condition.

Fixes: ef15314aa5 ("bpf: Add BPF_PROG_BIND_MAP syscall")
Reported-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20201003002544.3601440-1-sdf@google.com

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Stanislav Fomichev 2020-10-02 17:25:44 -07:00 • committed by Alexei Starovoitov

parent fb91db01c6

commit 1028ae4069

1 changed files with 3 additions and 1 deletions

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kernel/bpf/syscall.c

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