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Message-Id: <20210712061018.770028230@linuxfoundation.org>
Date: Mon, 12 Jul 2021 08:08:28 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Wang Hai <wanghai38@...wei.com>,
Andrii Nakryiko <andrii@...nel.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 485/800] samples/bpf: Fix Segmentation fault for xdp_redirect command
From: Wang Hai <wanghai38@...wei.com>
[ Upstream commit 85102ba58b4125ebad941d7555c3c248b23efd16 ]
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@...wei.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Link: https://lore.kernel.org/bpf/20210616042324.314832-1-wanghai38@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
samples/bpf/xdp_redirect_user.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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;
}
--
2.30.2
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