[2.6 patch] drivers/media/dvb/bt8xx/dst_ca.c: fix 2 memory leaks

[Adrian Bunk <bunk@stusta.de>]

On Sat, Mar 11, 2006 at 05:12:13PM +0100, Adrian Bunk wrote:
> On Sat, Mar 11, 2006 at 07:53:34PM +0400, Manu Abraham wrote:
> > 
> > Yeah, it is better indeed. Would you mind if i schedule this for a 
> > little while later, since i have a couple of other fixes/additions as well ?
> 
> There's no need to hurry since the whole problem is only a small memory 
> leak in a very unlikely case.

But when you'll apply it, please used the improved version below (based 
on a suggestion by Ingo Oeser).

cu
Adrian


<--  snip  -->


The Coverity checker spotted that thre was a memory leak if the second
or third kmalloc() failed.

Besides this, I've also consolidated the three error handlings into one 
and removed the unneeded casts.


Signed-off-by: Adrian Bunk <bunk@stusta.de>

---

 drivers/media/dvb/bt8xx/dst_ca.c |   19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

--- linux-2.6.16-rc5-mm3-full/drivers/media/dvb/bt8xx/dst_ca.c.old	2006-03-11 14:36:59.000000000 +0100
+++ linux-2.6.16-rc5-mm3-full/drivers/media/dvb/bt8xx/dst_ca.c	2006-03-11 15:28:26.000000000 +0100
@@ -473,18 +473,17 @@ static int dst_ca_ioctl(struct inode *in
 	void __user *arg = (void __user *)ioctl_arg;
 	int result = 0;
 
-	if ((p_ca_message = (struct ca_msg *) kmalloc(sizeof (struct ca_msg), GFP_KERNEL)) == NULL) {
-		dprintk(verbose, DST_CA_ERROR, 1, " Memory allocation failure");
-		return -ENOMEM;
-	}
-	if ((p_ca_slot_info = (struct ca_slot_info *) kmalloc(sizeof (struct ca_slot_info), GFP_KERNEL)) == NULL) {
-		dprintk(verbose, DST_CA_ERROR, 1, " Memory allocation failure");
-		return -ENOMEM;
-	}
-	if ((p_ca_caps = (struct ca_caps *) kmalloc(sizeof (struct ca_caps), GFP_KERNEL)) == NULL) {
+	p_ca_message = kmalloc(sizeof (struct ca_msg), GFP_KERNEL);
+	p_ca_slot_info = kmalloc(sizeof (struct ca_slot_info), GFP_KERNEL);
+	p_ca_caps = kmalloc(sizeof (struct ca_caps), GFP_KERNEL);
+
+
+	if (!p_ca_message || !p_ca_slot_info || !p_ca_caps) {
 		dprintk(verbose, DST_CA_ERROR, 1, " Memory allocation failure");
-		return -ENOMEM;
+		result = -ENOMEM;
+		goto free_mem_and_exit;
 	}
+
 	/*	We have now only the standard ioctl's, the driver is upposed to handle internals.	*/
 	switch (cmd) {
 	case CA_SEND_MSG:

-
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