[patch 39/47] drivers/isdn/i4l/isdn_common.c fix small resourceleak

[Greg KH]

2.6.25-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Darren Jenkins <darrenrjenkins@xxxxxxxxx>

commit 4fc89e3911aa5357b55b85b60c4beaeb8a48a290 upstream

Coverity CID: 1356 RESOURCE_LEAK

I found a very old patch for this that was Acked but did not get applied
https://lists.linux-foundation.org/pipermail/kernel-janitors/2006-September/016362.html

There looks to be a small leak in isdn_writebuf_stub() in isdn_common.c, when
copy_from_user() returns an un-copied data length (length != 0).  The below
patch should be a minimally invasive fix.

Signed-off-by: Darren Jenkins <darrenrjenkins@xxxxxxxxx>
Acked-by: Karsten Keil <kkeil@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/isdn/i4l/isdn_common.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1977,8 +1977,10 @@ isdn_writebuf_stub(int drvidx, int chan,
 	if (!skb)
 		return -ENOMEM;
 	skb_reserve(skb, hl);
-	if (copy_from_user(skb_put(skb, len), buf, len))
+	if (copy_from_user(skb_put(skb, len), buf, len)) {
+		dev_kfree_skb(skb);
 		return -EFAULT;
+	}
 	ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
 	if (ret <= 0)
 		dev_kfree_skb(skb);

-- 
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