security: check for kstrdup() failure in lsm_append()

ebiggers · James Morris · commit 87ea58433208 · 2018-07-17T21:27:06.000-07:00
lsm_append() should return -ENOMEM if memory allocation failed. Fixes: d69dece ("LSM: Add /sys/kernel/security/lsm") Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: James Morris <james.morris@microsoft.com>
diff --git a/security/security.c b/security/security.c
@@ -118,6 +118,8 @@ static int lsm_append(char *new, char **result)
 
 	if (*result == NULL) {
 		*result = kstrdup(new, GFP_KERNEL);
+		if (*result == NULL)
+			return -ENOMEM;
 	} else {
 		/* Check if it is the last registered name */
 		if (match_last_lsm(*result, new))
