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authorWang Hai <wanghai38@huawei.com>2021-06-16 07:23:24 +0300
committerAndrii Nakryiko <andrii@kernel.org>2021-06-18 21:10:26 +0300
commit85102ba58b4125ebad941d7555c3c248b23efd16 (patch)
treec2851ff389ee9ff9db5df9ba36416d929a96efd0 /samples
parent0c38740c08962ab109267cb23f4a40df2ccf2bbf (diff)
downloadlinux-85102ba58b4125ebad941d7555c3c248b23efd16.tar.xz
samples/bpf: Fix Segmentation fault for xdp_redirect command
A Segmentation fault error is caused when the following command is executed. $ sudo ./samples/bpf/xdp_redirect lo Segmentation fault This command is missing a device <IFNAME|IFINDEX> as an argument, resulting in out-of-bounds access from argv. If the number of devices for the xdp_redirect parameter is not 2, we should report an error and exit. Fixes: 24251c264798 ("samples/bpf: add option for native and skb mode for redirect apps") Signed-off-by: Wang Hai <wanghai38@huawei.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210616042324.314832-1-wanghai38@huawei.com
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/xdp_redirect_user.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/xdp_redirect_user.c b/samples/bpf/xdp_redirect_user.c
index 41d705c3a1f7..eb876629109a 100644
--- a/samples/bpf/xdp_redirect_user.c
+++ b/samples/bpf/xdp_redirect_user.c
@@ -130,7 +130,7 @@ int main(int argc, char **argv)
if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
xdp_flags |= XDP_FLAGS_DRV_MODE;
- if (optind == argc) {
+ if (optind + 2 != argc) {
printf("usage: %s <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n", argv[0]);
return 1;
}