When a UDP packet gets fragmented, a crash will occur during
reassembly.
skb->transport_header is not set during earlier period of fragment
reassembly. As a consequence, calll to udp_hdr() return NULL and uh
(which is NULL) gets dereferenced without much test.
I will post a patch later that will set skb->transport_header
correctly in lowpan_process_data(), so that
lowpan_uncompress_udp_header() behave as intended.
---
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 32eb417..a52e795 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -317,6 +317,9 @@ lowpan_uncompress_udp_header(struct sk_buff *skb)
{
struct udphdr *uh = udp_hdr(skb);
u8 tmp;
+
+ if (!uh)
+ goto err;
tmp = lowpan_fetch_skb_u8(skb);
--
1.7.3.4