samples/bpf: Fix Segmentation fault for xdp_redirect command

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[ Upstream commit 85102ba58b ]

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: 24251c2647 ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Wang Hai 2021-06-16 12:23:24 +08:00 • committed by Greg Kroah-Hartman

parent a6f6a2fe3f

commit 9abfeb4e2c

1 changed files with 1 additions and 1 deletions

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samples/bpf/xdp_redirect_user.c

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