[Xen-changelog] [qemu-xen-4.1-testing] e1000: fix compile warning introduced by security fix, and debugging

[patchbot@xxxxxxx]

commit 7a3a2aaa8fd1049fa0f033c5113e165900c84758
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Thu Jan 17 15:52:16 2013 +0000

    e1000: fix compile warning introduced by security fix, and debugging
    
    e33f918c19e393900b95a2bb6b10668dfe96a8f2, the fix for XSA-41,
    and its cherry picks in 4.2 and 4.1 introduced this compiler warning:
      hw/e1000.c:641: warning: 'return' with a value, in function returning void
    
    In upstream qemu (where this change came from), e1000_receive returns
    a value used by queueing machinery to decide whether to try
    resubmitting the packet later.  Returning "size" means that the packet
    has been dealt with and should not be retried.
    
    In this old branch (aka qemu-xen-traditional), this machinery is
    absent and e1000_receive returns void.  Fix the return statement.
    
    Also add a debugging statement along the lines of the others in this
    function.
    
    Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
    (cherry picked from commit 2a1354d655d816feaad7dbdb8364f40a208439c1)
---
 hw/e1000.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/hw/e1000.c b/hw/e1000.c
index 67d2651..c75bc5e 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -638,7 +638,8 @@ e1000_receive(void *opaque, const uint8_t *buf, int size)
         (size > MAXIMUM_ETHERNET_VLAN_SIZE
         && !(s->mac_reg[RCTL] & E1000_RCTL_LPE)))
         && !(s->mac_reg[RCTL] & E1000_RCTL_SBP)) {
-        return size;
+        DBGOUT(RX, "packet too large for applicable LPE/VLAN size\n");
+        return;
     }
 
     if (!receive_filter(s, buf, size))
--
generated by git-patchbot for /home/xen/git/qemu-xen-4.1-testing.git

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