linux-kernel - [PATCH] KEYS: key refcounting cleanup in keyctl_read

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Date:   Tue, 19 Sep 2017 19:51:08 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     keyrings@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Konstantin Khorenko <khorenko@...tuozzo.com>
Subject: [PATCH] KEYS: key refcounting cleanup in keyctl_read_key

key_put is lost if key_permission() returns non-EACCES error

Fixes: 29db919063406 ("Keys: Add LSM hooks for key management [try #3]")
Reported-by: Konstantin Khorenko <khorenko@...tuozzo.com>
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 security/keys/keyctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index ab0b337..70efb2d 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -771,7 +771,7 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
 	if (ret == 0)
 		goto can_read_key;
 	if (ret != -EACCES)
-		goto error;
+		goto error2;
 
 	/* we can't; see if it's searchable from this process's keyrings
 	 * - we automatically take account of the fact that it may be
-- 
2.7.4