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