linux-kernel - [PATCH 5.15 282/917] samples/bpf: Fix application of sizeof to pointer

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Date:   Mon, 15 Nov 2021 17:56:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zeal Robot <zealci@....com.cn>,
        David Yang <davidcomponentone@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 282/917] samples/bpf: Fix application of sizeof to pointer

From: David Yang <davidcomponentone@...il.com>

[ Upstream commit b599015f044df53e93ad0a2957b615bc1a26bf73 ]

The coccinelle check report:
"./samples/bpf/xdp_redirect_cpu_user.c:397:32-38:
ERROR: application of sizeof to pointer"
Using the "strlen" to fix it.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: David Yang <davidcomponentone@...il.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Link: https://lore.kernel.org/bpf/20211012111649.983253-1-davidcomponentone@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 samples/bpf/xdp_redirect_cpu_user.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
index 6e25fba64c72b..d84e6949007cc 100644
--- a/samples/bpf/xdp_redirect_cpu_user.c
+++ b/samples/bpf/xdp_redirect_cpu_user.c
@@ -325,7 +325,6 @@ int main(int argc, char **argv)
 	int add_cpu = -1;
 	int ifindex = -1;
 	int *cpu, i, opt;
-	char *ifname;
 	__u32 qsize;
 	int n_cpus;
 
@@ -393,9 +392,8 @@ int main(int argc, char **argv)
 				fprintf(stderr, "-d/--dev name too long\n");
 				goto end_cpu;
 			}
-			ifname = (char *)&ifname_buf;
-			safe_strncpy(ifname, optarg, sizeof(ifname));
-			ifindex = if_nametoindex(ifname);
+			safe_strncpy(ifname_buf, optarg, strlen(ifname_buf));
+			ifindex = if_nametoindex(ifname_buf);
 			if (!ifindex)
 				ifindex = strtoul(optarg, NULL, 0);
 			if (!ifindex) {
-- 
2.33.0