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authorWillem de Bruijn <willemb@google.com>2018-01-19 09:29:18 -0500
committerDavid S. Miller <davem@davemloft.net>2018-01-22 16:01:30 -0500
commit121d57af308d0cf943f08f4738d24d3966c38cd9 (patch)
tree6089dfcad08b4d02fe8e8082f2d278a5cbec05a3 /net/sctp/offload.c
parent7c68d1a6b4db9012790af7ac0f0fdc0d2083422a (diff)
gso: validate gso_type in GSO handlers
Validate gso_type during segmentation as SKB_GSO_DODGY sources may pass packets where the gso_type does not match the contents. Syzkaller was able to enter the SCTP gso handler with a packet of gso_type SKB_GSO_TCPV4. On entry of transport layer gso handlers, verify that the gso_type matches the transport protocol. Fixes: 90017accff61 ("sctp: Add GSO support") Link: http://lkml.kernel.org/r/<001a1137452496ffc305617e5fe0@google.com> Reported-by: syzbot+fee64147a25aecd48055@syzkaller.appspotmail.com Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/offload.c')
-rw-r--r--net/sctp/offload.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sctp/offload.c b/net/sctp/offload.c
index 275925b93b29..35bc7106d182 100644
--- a/net/sctp/offload.c
+++ b/net/sctp/offload.c
@@ -45,6 +45,9 @@ static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
struct sk_buff *segs = ERR_PTR(-EINVAL);
struct sctphdr *sh;
+ if (!(skb_shinfo(skb)->gso_type & SKB_GSO_SCTP))
+ goto out;
+
sh = sctp_hdr(skb);
if (!pskb_may_pull(skb, sizeof(*sh)))
goto out;