[Xen-changelog] [linux-2.6.18-xen] netback: correct netbk_tx_err() to handle wrap around

[Xen patchbot-linux-2.6.18-xen <patchbot@xxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1360056227 -3600
# Node ID d962d1681b10974cf6bcdc4240c904c712db3e62
# Parent  5108c6901b3057c52c180b589469c68ea9c2121f
netback: correct netbk_tx_err() to handle wrap around

This is CVE-2013-0216 / XSA-39.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r 5108c6901b30 -r d962d1681b10 drivers/xen/netback/netback.c
--- a/drivers/xen/netback/netback.c     Tue Feb 05 10:20:09 2013 +0100
+++ b/drivers/xen/netback/netback.c     Tue Feb 05 10:23:47 2013 +0100
@@ -1011,7 +1011,7 @@ static void netbk_tx_err(netif_t *netif,
 
        do {
                make_tx_response(netif, txp, NETIF_RSP_ERROR);
-               if (cons >= end)
+               if (cons == end)
                        break;
                txp = RING_GET_REQUEST(&netif->tx, cons++);
        } while (1);

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