[Xen-changelog] [qemu-upstream-unstable] net: avoid infinite loop when receiving packets(CVE-2015-5278)

[patchbot@xxxxxxx]

commit 8ad9e71fc937439730fa68e82d6da11a50eb5c04
Author:     P J P <pjp@xxxxxxxxxxxxxxxxx>
AuthorDate: Tue Sep 15 16:46:59 2015 +0530
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
CommitDate: Tue Sep 15 13:43:47 2015 +0000

    net: avoid infinite loop when receiving packets(CVE-2015-5278)
    
    Ne2000 NIC uses ring buffer of NE2000_MEM_SIZE(49152)
    bytes to process network packets. While receiving packets
    via ne2000_receive() routine, a local 'index' variable
    could exceed the ring buffer size, leading to an infinite
    loop situation.
    
    upstream-commit-id: 737d2b3c41d59eb8f94ab7eb419b957938f24943
    
    Reported-by: Qinghao Tang <luodalongde@xxxxxxxxx>
    Signed-off-by: P J P <pjp@xxxxxxxxxxxxxxxxx>
    Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 hw/net/ne2000.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index 109ef4e..63f1960 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -256,7 +256,7 @@ ssize_t ne2000_receive(NetClientState *nc, const uint8_t 
*buf, size_t size_)
         if (index <= s->stop)
             avail = s->stop - index;
         else
-            avail = 0;
+            break;
         len = size;
         if (len > avail)
             len = avail;
--
generated by git-patchbot for /home/xen/git/qemu-upstream-unstable.git

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