linux-kernel - Re: [GIT] Security changes for 2.6.29

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Date:	Mon, 29 Dec 2008 00:41:51 +0000
From:	David Howells <dhowells@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	dhowells@...hat.com, James Morris <jmorris@...ei.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [GIT] Security changes for 2.6.29


Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> Yes, it's possible that this is just a bogus warning, with gcc-4.3.2 for
> x86-64, but please fix it.

Does this fix the warning?  My compiler doesn't show it; of course, I'm not
using gcc-4.3.2, but something older.

David
---
KEYS: Fix variable uninitialisation warnings

From: David Howells <dhowells@...hat.com>

Fix variable uninitialisation warnings introduced in:

	commit 8bbf4976b59fc9fc2861e79cab7beb3f6d647640
	Author: David Howells <dhowells@...hat.com>
	Date:   Fri Nov 14 10:39:14 2008 +1100

	KEYS: Alter use of key instantiation link-to-keyring argument

As:

  security/keys/keyctl.c: In function 'keyctl_negate_key':
  security/keys/keyctl.c:976: warning: 'dest_keyring' may be used uninitialized in this function
  security/keys/keyctl.c: In function 'keyctl_instantiate_key':
  security/keys/keyctl.c:898: warning: 'dest_keyring' may be used uninitialized in this function

Some versions of gcc notice that get_instantiation_key() doesn't always set
*_dest_keyring, but fail to observe that if this happens then *_dest_keyring
will not be read by the caller.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 security/keys/keyctl.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)


diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 7c72baa..6688765 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -838,11 +838,11 @@ static long get_instantiation_keyring(key_serial_t ringid,
 {
 	key_ref_t dkref;
 
+	*_dest_keyring = NULL;
+
 	/* just return a NULL pointer if we weren't asked to make a link */
-	if (ringid == 0) {
-		*_dest_keyring = NULL;
+	if (ringid == 0)
 		return 0;
-	}
 
 	/* if a specific keyring is nominated by ID, then use that */
 	if (ringid > 0) {
--
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