samples/bpf: Fix buffer overflow in tcp_basertt

[ Upstream commit f4dea9689c ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pengcheng Yang 2023-05-05 16:50:58 +08:00 committed by Greg Kroah-Hartman
parent a7434a4dcc
commit 56c25f2763
1 changed files with 1 additions and 1 deletions

View File

@ -47,7 +47,7 @@ int bpf_basertt(struct bpf_sock_ops *skops)
case BPF_SOCK_OPS_BASE_RTT:
n = bpf_getsockopt(skops, SOL_TCP, TCP_CONGESTION,
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 */
rv = 80;
} else if (n) {