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

[Jiri Kosina <jikos@jikos.cz>]

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@suse.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@suse.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;