From: Cong Wang <cong.w...@bytedance.com>
[ Upstream commit 085c7c4e1c0e50d90b7d90f61a12e12b317a91e2 ]
Both version 0 and version 1 use ETH_P_ERSPAN, but version 0 does not
have an erspan header. So the check in gre_parse_header() is wrong,
we have to distinguish version 1 from version 0.
We can just check the gre header length like is_erspan_type1().
Fixes: cb73ee40b1b3 ("net: ip_gre: use erspan key field for tunnel lookup")
Reported-by: syzbot+f583ce3d4ddf9836b...@syzkaller.appspotmail.com
Cc: William Tu <u9012...@gmail.com>
Cc: Lorenzo Bianconi <lorenzo.bianc...@redhat.com>
Signed-off-by: Cong Wang <cong.w...@bytedance.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/ipv4/gre_demux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv4/gre_demux.c
+++ b/net/ipv4/gre_demux.c
@@ -128,7 +128,7 @@ int gre_parse_header(struct sk_buff *skb
* to 0 and sets the configured key in the
* inner erspan header field
*/
- if (greh->protocol == htons(ETH_P_ERSPAN) ||
+ if ((greh->protocol == htons(ETH_P_ERSPAN) && hdr_len != 4) ||
greh->protocol == htons(ETH_P_ERSPAN2)) {
struct erspan_base_hdr *ershdr;
