netdev - [PATCH iproute2] iproute_lwtunnel: fix array boundary check

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Date: Mon, 29 May 2023 23:42:16 +0200
From: Andrea Claudi <aclaudi@...hat.com>
To: netdev@...r.kernel.org
Cc: stephen@...workplumber.org,
	dsahern@...il.com
Subject: [PATCH iproute2] iproute_lwtunnel: fix array boundary check

seg6_mode_types is made up of 5 elements, so ARRAY_SIZE(seg6_mode_types)
evaluates to 5. Thus, when mode = 5, this function returns
seg6_mode_types[5], resulting in an out-of-bound access.

Fix this bailing out when mode is equal to or greater than 5.

Fixes: cf87da417bb4 ("iproute: add support for seg6 l2encap mode")
Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
---
 ip/iproute_lwtunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index 96de3b20..94985972 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -140,7 +140,7 @@ static const char *seg6_mode_types[] = {
 
 static const char *format_seg6mode_type(int mode)
 {
-	if (mode < 0 || mode > ARRAY_SIZE(seg6_mode_types))
+	if (mode < 0 || mode >= ARRAY_SIZE(seg6_mode_types))
 		return "<unknown>";
 
 	return seg6_mode_types[mode];
-- 
2.40.1