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samples/bpf: Fix buffer overflow in tcp_basertt

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Using sizeof(nv) or strlen(nv)+1 is correct.

Fixes: c890063e44 ("bpf: sample BPF_SOCKET_OPS_BASE_RTT program")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
Link: https://lore.kernel.org/r/1683276658-2860-1-git-send-email-yangpc@wangsu.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Pengcheng Yang 2023-05-05 16:50:58 +08:00 committed by Alexei Starovoitov
parent 6953518629
commit f4dea9689c
1 changed files with 1 additions and 1 deletions
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2
samples/bpf/tcp_basertt_kern.c
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@ -47,7 +47,7 @@ int bpf_basertt(struct bpf_sock_ops *skops)
case BPF_SOCK_OPS_BASE_RTT: case BPF_SOCK_OPS_BASE_RTT:
n = bpf_getsockopt(skops, SOL_TCP, TCP_CONGESTION, n = bpf_getsockopt(skops, SOL_TCP, TCP_CONGESTION,
cong, sizeof(cong)); cong, sizeof(cong));
if (!n && !__builtin_memcmp(cong, nv, sizeof(nv)+1)) { if (!n && !__builtin_memcmp(cong, nv, sizeof(nv))) {
/* Set base_rtt to 80us */ /* Set base_rtt to 80us */
rv = 80; rv = 80;
} else if (n) { } else if (n) {