security: check for kstrdup() failure in lsm_append()
[ Upstream commit 87ea58433208d17295e200d56be5e2a4fe4ce7d6 ]
lsm_append() should return -ENOMEM if memory allocation failed.
Fixes: d69dece5f5b6 ("LSM: Add /sys/kernel/security/lsm")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/security/security.c b/security/security.c
index 4bf0f57..95a1a0f 100644
--- a/security/security.c
+++ b/security/security.c
@@ -111,6 +111,8 @@ 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))