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[PATCH] ISDN: Avoid a potential NULL ptr deref in ippp

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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>
This commit is contained in:
Jesper Juhl 2006-12-08 02:39:34 -08:00 committed by Linus Torvalds
parent ba6d14aff4
commit f6e2cdc8aa
1 changed files with 5 additions and 0 deletions
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5
drivers/isdn/i4l/isdn_ppp.c
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@ -2536,6 +2536,11 @@ static struct sk_buff *isdn_ppp_decompress(struct sk_buff *skb,struct ippp_struc
rsparm.maxdlen = IPPP_RESET_MAXDATABYTES;
skb_out = dev_alloc_skb(is->mru + PPP_HDRLEN);
if (!skb_out) {
kfree_skb(skb);
printk(KERN_ERR "ippp: decomp memory allocation failure\n");
return NULL;
}
len = ipc->decompress(stat, skb, skb_out, &rsparm);
kfree_skb(skb);
if (len <= 0) {