[Xen-changelog] [qemu-upstream-unstable] rtl8139: check TCP Data Offset field

[patchbot@xxxxxxx]

commit 94db81945c93c679fb5d2eb7d3beb98802f99d93
Author:     Stefan Hajnoczi <stefanha@xxxxxxxxxx>
AuthorDate: Wed Jul 15 18:17:04 2015 +0100
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
CommitDate: Mon Aug 3 13:52:25 2015 +0000

    rtl8139: check TCP Data Offset field
    
    The TCP Data Offset field contains the length of the header.  Make sure
    it is valid and does not exceed the IP data length.
    
    Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 hw/net/rtl8139.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index c8f0df9..2df4a51 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -2253,6 +2253,11 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
 
                 int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
 
+                /* Invalid TCP data offset? */
+                if (tcp_hlen < sizeof(tcp_header) || tcp_hlen > ip_data_len) {
+                    goto skip_offload;
+                }
+
                 /* ETH_MTU = ip header len + tcp header len + payload */
                 int tcp_data_len = ip_data_len - tcp_hlen;
                 int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
--
generated by git-patchbot for /home/xen/git/qemu-upstream-unstable.git

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