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authorHaishuang Yan <yanhaishuang@cmss.chinamobile.com>2018-09-14 12:26:47 +0800
committerDavid S. Miller <davem@davemloft.net>2018-09-16 15:32:59 -0700
commitb0350d51f001e6edc13ee4f253b98b50b05dd401 (patch)
tree004ac6f76db27619669e99ecec2138db92500fee /net/ipv4/gre_demux.c
parent21e65923abaa8f64e1f12491b2c5a8c208f9cfe3 (diff)
downloadlinux-b0350d51f001e6edc13ee4f253b98b50b05dd401.tar.bz2
ip_gre: fix parsing gre header in ipgre_err
gre_parse_header stops parsing when csum_err is encountered, which means tpi->key is undefined and ip_tunnel_lookup will return NULL improperly. This patch introduce a NULL pointer as csum_err parameter. Even when csum_err is encountered, it won't return error and continue parsing gre header as expected. Fixes: 9f57c67c379d ("gre: Remove support for sharing GRE protocol hook.") Reported-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/gre_demux.c')
-rw-r--r--net/ipv4/gre_demux.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c
index b798862b6be5..7efe740c06eb 100644
--- a/net/ipv4/gre_demux.c
+++ b/net/ipv4/gre_demux.c
@@ -86,13 +86,14 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
options = (__be32 *)(greh + 1);
if (greh->flags & GRE_CSUM) {
- if (skb_checksum_simple_validate(skb)) {
+ if (!skb_checksum_simple_validate(skb)) {
+ skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
+ null_compute_pseudo);
+ } else if (csum_err) {
*csum_err = true;
return -EINVAL;
}
- skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
- null_compute_pseudo);
options++;
}