[PATCH bpf-next] samples/bpf: xdp_router_ipv4_user: Fix write overflow

[Rong Tao]

From: Rong Tao <rongtao@xxxxxxxx>

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

Signed-off-by: Rong Tao <rongtao@xxxxxxxx>
---
 samples/bpf/xdp_router_ipv4_user.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/bpf/xdp_router_ipv4_user.c b/samples/bpf/xdp_router_ipv4_user.c
index 683913bbf279..9d41db09c480 100644
--- a/samples/bpf/xdp_router_ipv4_user.c
+++ b/samples/bpf/xdp_router_ipv4_user.c
@@ -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;
-- 
2.38.1