bpf: Don't leak memory in bpf getsockopt when optlen == 0

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optlen == 0 indicates that the kernel should ignore BPF buffer
and use the original one from the user. We, however, forget
to free the temporary buffer that we've allocated for BPF.

Fixes: d8fe449a9c ("bpf: Don't return EINVAL from {get,set}sockopt when optlen > PAGE_SIZE")
Reported-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210112162829.775079-1-sdf@google.com

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Stanislav Fomichev 2021-01-12 08:28:29 -08:00 • committed by Daniel Borkmann

parent 2f94ac1918

commit 4be34f3d07

1 changed files with 3 additions and 2 deletions

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kernel/bpf/cgroup.c

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