bpf, sockmap: fix leak in bpf_tcp_sendmsg wait for mem path

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In bpf_tcp_sendmsg() the sk_alloc_sg() may fail. In the case of
ENOMEM, it may also mean that we've partially filled the scatterlist
entries with pages. Later jumping to sk_stream_wait_memory()
we could further fail with an error for several reasons, however
we miss to call free_start_sg() if the local sk_msg_buff was used.

Fixes: 4f738adba3 ("bpf: create tcp_bpf_ulp allowing BPF to monitor socket TX/RX data")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Daniel Borkmann 2018-08-08 19:23:14 +02:00 • committed by Alexei Starovoitov

parent 5121700b34

commit 7c81c71730

1 changed files with 5 additions and 2 deletions

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kernel/bpf/sockmap.c

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