File 0139-net-pcnet-check-rx-tx-descriptor-ri.patch of Package qemu.4226

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File 0139-net-pcnet-check-rx-tx-descriptor-ri.patch of Package qemu.4226

From 46c7bcfbc9f02e8634fa737b671135747920a887 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Fri, 30 Sep 2016 00:27:33 +0530
Subject: [PATCH] net: pcnet: check rx/tx descriptor ring length

The AMD PC-Net II emulator has set of control and status(CSR)
registers. Of these, CSR76 and CSR78 hold receive and transmit
descriptor ring length respectively. This ring length could range
from 1 to 65535. Setting ring length to zero leads to an infinite
loop in pcnet_rdra_addr() or pcnet_transmit(). Add check to avoid it.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 34e29ce754c02bb6b3bdd244fbb85033460feaff)
[BR: CVE-2016-7909 BSC#1002557]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/net/pcnet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index 469b9d7f08..4e69975a1e 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -1436,8 +1436,11 @@ static void pcnet_csr_writew(PCNetState *s, uint32_t rap, uint32_t new_value)
     case 47: /* POLLINT */
     case 72:
     case 74:
+        break;
     case 76: /* RCVRL */
     case 78: /* XMTRL */
+        val = (val > 0) ? val : 512;
+        break;
     case 112:
        if (CSR_STOP(s) || CSR_SPND(s))
            break;

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File 0139-net-pcnet-check-rx-tx-descriptor-ri.patch of Package qemu.4226

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