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tcp_bpf: propagate error code in tcp_bpf_sendmsg()

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In tcp_bpf_sendmsg(), the value returned by sk_msg_memcopy_from_iter()
is checked for error but not propagated to 'out_err' label, so error
handling may not work as expected. Fix this by assigning error value
to 'err', thus making sure that error won't be silently ignored.

Reported-by: Sashiko <shodan.ai@mcst.ru>
Fixes: 5153a75ef3 ("tcp_bpf: Fix copied value in tcp_bpf_sendmsg")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@kernel.org>
Link: https://patch.msgid.link/20261019082214.102398-1-dmantipov@yandex.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dmitry Antipov 2026-10-19 11:22:14 +03:00 committed by Jakub Kicinski
parent d5d524f469
commit 82e31923c0
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/tcp_bpf.c
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@ -581,6 +581,7 @@ static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
copy);
if (ret < 0) {
sk_msg_trim(sk, msg_tx, osize);
err = ret;
goto out_err;
}