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| author | Tony Cheneau <tony.cheneau@amnesiak.org> | 2012-07-11 06:51:14 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-16 22:51:15 -0700 |
| commit | d4787a15432384826a0bed42d189fc2a97dc73ea (patch) | |
| tree | 211b8183a67dd12d817146265485a597a4f85942 /net/ieee802154 | |
| parent | 6e5928f6dfd92a47c489bb735c4cb8bbb62038e0 (diff) | |
| download | linux-exynos-d4787a15432384826a0bed42d189fc2a97dc73ea.tar.gz linux-exynos-d4787a15432384826a0bed42d189fc2a97dc73ea.tar.bz2 linux-exynos-d4787a15432384826a0bed42d189fc2a97dc73ea.zip | |
6lowpan: Fix null pointer dereference in UDP uncompression function
When a UDP packet gets fragmented, a crash will occur at reassembly time.
This is because skb->transport_header is not set during earlier period of fragment reassembly.
As a consequence, call to udp_hdr() return NULL and uh (which is NULL) gets
dereferenced without much test.
Signed-off-by: Tony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ieee802154')
| -rw-r--r-- | net/ieee802154/6lowpan.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c index 6871ec1b30f8..416a54d31fb2 100644 --- a/net/ieee802154/6lowpan.c +++ b/net/ieee802154/6lowpan.c @@ -314,6 +314,9 @@ lowpan_uncompress_udp_header(struct sk_buff *skb) struct udphdr *uh = udp_hdr(skb); u8 tmp; + if (!uh) + goto err; + if (lowpan_fetch_skb_u8(skb, &tmp)) goto err; |