[Xen-changelog] [qemu-xen-traditional stable-4.4] rtl8139: check IP Total Length field

[patchbot@xxxxxxx]

commit a73852b44eafc177eb9a10cf8c47f3170ecad29b
Author:     Stefan Hajnoczi <stefanha@xxxxxxxxxx>
AuthorDate: Wed Jul 15 18:17:02 2015 +0100
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Tue May 10 19:16:20 2016 +0100

    rtl8139: check IP Total Length field
    
    The IP Total Length field includes the IP header and data.  Make sure it
    is valid and does not exceed the Ethernet payload size.
    
    Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
    [Backport to qemu-xen-tradition]
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 hw/rtl8139.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index b71ea62..d49d6fa 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -2144,7 +2144,12 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
             }
 
             ip_protocol = ip->ip_p;
-            ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
+
+            ip_data_len = be16_to_cpu(ip->ip_len);
+            if (ip_data_len < hlen || ip_data_len > eth_payload_len) {
+                goto skip_offload;
+            }
+            ip_data_len -= hlen;
 
             if (txdw0 & CP_TX_IPCS)
             {
--
generated by git-patchbot for /home/xen/git/qemu-xen-traditional.git#stable-4.4

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