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From fdc89e90fac40c5ca2686733df17b6423fb8d8fb Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Wed, 30 May 2018 13:08:15 +0800
Subject: [PATCH] ne2000: fix possible out of bound access in ne2000_receive
In ne2000_receive(), we try to assign size_ to size which converts
from size_t to integer. This will cause troubles when size_ is greater
INT_MAX, this will lead a negative value in size and it can then pass
the check of size < MIN_BUF_SIZE which may lead out of bound access of
for both buf and buf1.
Fixing by converting the type of size to size_t.
CC: qemu-stable@nongnu.org
Reported-by: Daniel Shapira <daniel@twistlock.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Upstream-Status: Backport [https://git.qemu.org/?p=qemu.git;a=commitdiff
;h=fdc89e90fac40c5ca2686733df17b6423fb8d8fb#patch1]
CVE: CVE-2018-10839 CVE-2018-17958
Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
hw/net/ne2000.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index 07d79e3..869518e 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -174,7 +174,7 @@ static int ne2000_buffer_full(NE2000State *s)
ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
{
NE2000State *s = qemu_get_nic_opaque(nc);
- int size = size_;
+ size_t size = size_;
uint8_t *p;
unsigned int total_len, next, avail, len, index, mcast_idx;
uint8_t buf1[60];
@@ -182,7 +182,7 @@ ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
#if defined(DEBUG_NE2000)
- printf("NE2000: received len=%d\n", size);
+ printf("NE2000: received len=%zu\n", size);
#endif
if (s->cmd & E8390_STOP || ne2000_buffer_full(s))
--
1.8.3.1
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