From: Jesper Juhl <jesper.juhl@gmail.com>
Date: Fri, 8 Dec 2006 10:39:34 +0000 (-0800)
Subject: [PATCH] ISDN: Avoid a potential NULL ptr deref in ippp
X-Git-Tag: v2.6.20-rc1~34^2~145
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6e2cdc8aa395ea813603bfd81b70b5c461a8ebf;p=pandora-kernel.git

[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>
---

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