integrity: Free key restriction when keyring allocation fails

Commit Message

Guozihua (Scott) Nov. 9, 2022, 9:46 a.m. UTC

Key restriction is alloced in integrity_init_keyring(). However, if
keyring allocation failed, it is not freed, causing memory leaks.

Signed-off-by: GUO Zihua <[e-mail]>
---
 security/integrity/digsig.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 8a82a6c7f48a..f2193c531f4a 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -126,6 +126,7 @@  int __init integrity_init_keyring(const unsigned int id)
 {
 	struct key_restriction *restriction;
 	key_perm_t perm;
+	int ret;
 
 	perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
 		| KEY_USR_READ | KEY_USR_SEARCH;
@@ -154,7 +155,10 @@  int __init integrity_init_keyring(const unsigned int id)
 		perm |= KEY_USR_WRITE;
 
 out:
-	return __integrity_init_keyring(id, perm, restriction);
+	ret = __integrity_init_keyring(id, perm, restriction);
+	if (ret)
+		kfree(restriction);
+	return ret;
 }
 
 static int __init integrity_add_key(const unsigned int id, const void *data,