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[bpf] samples/bpf: Fix buffer overflow in tcp_basertt

Message ID 1683276658-2860-1-git-send-email-yangpc@wangsu.com (mailing list archive)
State Accepted
Commit f4dea9689c5fea3d07170c2cb0703e216f1a0922
Delegated to: BPF
Headers show
Series [bpf] samples/bpf: Fix buffer overflow in tcp_basertt | expand

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Commit Message

Pengcheng Yang May 5, 2023, 8:50 a.m. UTC 
Using sizeof(nv) or strlen(nv)+1 is correct.

Fixes: c890063e4404 ("bpf: sample BPF_SOCKET_OPS_BASE_RTT program")
Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
---
 samples/bpf/tcp_basertt_kern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

patchwork-bot+netdevbpf@kernel.org May 5, 2023, 3:40 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri,  5 May 2023 16:50:58 +0800 you wrote:
> Using sizeof(nv) or strlen(nv)+1 is correct.
> 
> Fixes: c890063e4404 ("bpf: sample BPF_SOCKET_OPS_BASE_RTT program")
> Signed-off-by: Pengcheng Yang <yangpc@wangsu.com>
> ---
>  samples/bpf/tcp_basertt_kern.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Here is the summary with links:
  - [bpf] samples/bpf: Fix buffer overflow in tcp_basertt
    https://git.kernel.org/bpf/bpf-next/c/f4dea9689c5f

You are awesome, thank you!
diff mbox series

Patch

diff --git a/samples/bpf/tcp_basertt_kern.c b/samples/bpf/tcp_basertt_kern.c
index 8dfe09a92fec..822b0742b815 100644
--- a/samples/bpf/tcp_basertt_kern.c
+++ b/samples/bpf/tcp_basertt_kern.c
@@ -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) {