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authorJesper Juhl <jesper.juhl@gmail.com>2006-12-08 05:39:34 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 11:29:01 -0500
commitf6e2cdc8aa395ea813603bfd81b70b5c461a8ebf (patch)
treecc6c66b9b53bfd313114c4b464223bef992449b4 /drivers/isdn
parentba6d14aff4112b9518856d2d3979a386cb3a2945 (diff)
[PATCH] ISDN: Avoid a potential NULL ptr deref in ippp
There's a potential problem in isdn_ppp.c::isdn_ppp_decompress(). dev_alloc_skb() may fail and return NULL. If it does we will be passing a NULL skb_out to ipc->decompress() and may also end up dereferencing a NULL pointer at *proto = isdn_ppp_strip_proto(skb_out); Correct this by testing 'skb_out' against NULL early and bail out. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Cc: Karsten Keil <kkeil@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/i4l/isdn_ppp.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index 175199088bf4..26e46720fc1c 100644
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -2536,6 +2536,11 @@ static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb,struct ippp_struc
2536 rsparm.maxdlen = IPPP_RESET_MAXDATABYTES; 2536 rsparm.maxdlen = IPPP_RESET_MAXDATABYTES;
2537 2537
2538 skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN); 2538 skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN);
2539 if (!skb_out) {
2540 kfree_skb(skb);
2541 printk(KERN_ERR "ippp: decomp memory allocation failure\n");
2542 return NULL;
2543 }
2539 len = ipc->decompress(stat, skb, skb_out, &rsparm); 2544 len = ipc->decompress(stat, skb, skb_out, &rsparm);
2540 kfree_skb(skb); 2545 kfree_skb(skb);
2541 if (len <= 0) { 2546 if (len <= 0) {