ipv4: fix a potential use after free in fou.c
pskb_may_pull() maybe change skb->data and make uh pointer oboslete,
so reload uh and guehdr
Fixes: 37dd0247 ("gue: Receive side for Generic UDP Encapsulation")
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index efa70ad..32e7892 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -87,6 +87,9 @@
if (!pskb_may_pull(skb, len))
goto drop;
+ uh = udp_hdr(skb);
+ guehdr = (struct guehdr *)&uh[1];
+
if (guehdr->version != 0)
goto drop;