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samples/bpf: Fix wrong allocation size in xdp_router_ipv4_user

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prefix_key->data allocates three bytes using alloca(), but four bytes are
actually accessed in the program.

Signed-off-by: Rong Tao <rongtao@cestc.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/tencent_F9E2E81922B0C181D05B96DAE5AB0ACE6B06@qq.com
This commit is contained in:
Rong Tao 2022-11-22 10:32:56 +08:00 committed by Daniel Borkmann
parent b74344cbed
commit 19a2bdbaad
1 changed files with 1 additions and 1 deletions
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samples/bpf/xdp_router_ipv4_user.c
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@ -162,7 +162,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
__be32 gw;
} *prefix_value;
prefix_key = alloca(sizeof(*prefix_key) + 3);
prefix_key = alloca(sizeof(*prefix_key) + 4);
prefix_value = alloca(sizeof(*prefix_value));
prefix_key->prefixlen = 32;