linux-kernel - Re: fs/block_dev.c:953: warning: 'found' might be used uninitialized in this function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0703281909240.29565@twin.jikos.cz>
Date:	Wed, 28 Mar 2007 19:23:32 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Lee Revell <rlrevell@...-job.com>,
	Andrew Morton <akpm@...ux-foundation.org>
cc:	Toralf Förster <toralf.foerster@....de>,
	andrea@...e.de, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: fs/block_dev.c:953: warning: 'found' might be used uninitialized
 in this function

On Wed, 28 Mar 2007, Lee Revell wrote:

> > I compiled current git source 2.6.21-rc5-g28defbe and got this warning:
> > ...
> > fs/block_dev.c: In function `bd_claim_by_kobject':
> > fs/block_dev.c:953: warning: 'found' might be used uninitialized in this
> > function
> > ...
> Most of these warnings are really GCC bugs.  Please examine the code
> in question.

Anyway imho this time gcc got it right?



From: Jiri Kosina <jkosina@...e.cz>

blockdev: bd_claim_by_kobject() could check value of unititalized pointer

Fixes this warning:

fs/block_dev.c: In function `bd_claim_by_kobject':
fs/block_dev.c:953: warning: 'found' might be used uninitialized in this function

struct bd_holder *found is initialized only when bd_claim() returns zero. If it
returns nonzero, ptr stays uninitialized. Later the value of the pointer is checked.

Signed-off-by: Jiri Kosina <jkosina@...e.cz>

diff --git a/drivers/usb/input/hid-tmff.c b/drivers/usb/input/hid-tmff.c
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 575076c..e87d84a 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -950,7 +950,7 @@ static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
 				struct kobject *kobj)
 {
 	int res;
-	struct bd_holder *bo, *found;
+	struct bd_holder *bo, *found = NULL;
 
 	if (!kobj)
 		return -EINVAL;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/