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| author | Jesper Juhl <jesper.juhl@gmail.com> | 2006-12-08 13:39:34 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-08 19:29:01 +0300 |
| commit | f6e2cdc8aa395ea813603bfd81b70b5c461a8ebf (patch) | |
| tree | cc6c66b9b53bfd313114c4b464223bef992449b4 /drivers/isdn | |
| parent | ba6d14aff4112b9518856d2d3979a386cb3a2945 (diff) | |
| download | linux-f6e2cdc8aa395ea813603bfd81b70b5c461a8ebf.tar.xz | |
[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.c | 5 |
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 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) { |