linux-kernel - [PATCH] xtensa: ISS: fix call to split_if

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Date:   Mon,  3 Jul 2023 11:08:22 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Chris Zankel <chris@...kel.net>, Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] xtensa: ISS: fix call to split_if_spec

split_if_spec expects a NULL-pointer as an end marker for the argument
list, but tuntap_probe never supplied that terminating NULL. As a result
incorrectly formatted interface specification string may cause a crash
because for the random memory access. Fix that by adding NULL terminator
to the split_if_spec argument list.

Fixes: 7282bee78798 ("[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 8")
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 arch/xtensa/platforms/iss/network.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c
index 7b97e6ab85a4..85c82cd42188 100644
--- a/arch/xtensa/platforms/iss/network.c
+++ b/arch/xtensa/platforms/iss/network.c
@@ -237,7 +237,7 @@ static int tuntap_probe(struct iss_net_private *lp, int index, char *init)
 
 	init += sizeof(TRANSPORT_TUNTAP_NAME) - 1;
 	if (*init == ',') {
-		rem = split_if_spec(init + 1, &mac_str, &dev_name);
+		rem = split_if_spec(init + 1, &mac_str, &dev_name, NULL);
 		if (rem != NULL) {
 			pr_err("%s: extra garbage on specification : '%s'\n",
 			       dev->name, rem);
-- 
2.30.2