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From 22ab26a5dcda3ff217d543a4eff8dbad9160ce1c Mon Sep 17 00:00:00 2001
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From: Xiao Wang <jasowang@redhat.com>
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Date: Fri, 11 Jan 2019 07:58:56 +0000
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Subject: [PATCH 01/11] ne2000: fix possible out of bound access in
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ne2000_receive
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Xiao Wang <jasowang@redhat.com>
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Message-id: <20190111075904.2030-2-jasowang@redhat.com>
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Patchwork-id: 83976
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O-Subject: [RHEL8 qemu-kvm PATCH 1/9] ne2000: fix possible out of bound access in ne2000_receive
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Bugzilla: 1636784
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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RH-Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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In ne2000_receive(), we try to assign size_ to size which converts
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from size_t to integer. This will cause troubles when size_ is greater
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INT_MAX, this will lead a negative value in size and it can then pass
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the check of size < MIN_BUF_SIZE which may lead out of bound access of
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for both buf and buf1.
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Fixing by converting the type of size to size_t.
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CC: qemu-stable@nongnu.org
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Reported-by: Daniel Shapira <daniel@twistlock.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit fdc89e90fac40c5ca2686733df17b6423fb8d8fb)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/net/ne2000.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
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index 3a9fc89..19fac06 100644
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--- a/hw/net/ne2000.c
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+++ b/hw/net/ne2000.c
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@@ -173,7 +173,7 @@ static int ne2000_buffer_full(NE2000State *s)
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ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
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{
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NE2000State *s = qemu_get_nic_opaque(nc);
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- int size = size_;
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+ size_t size = size_;
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uint8_t *p;
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unsigned int total_len, next, avail, len, index, mcast_idx;
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uint8_t buf1[60];
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@@ -181,7 +181,7 @@ ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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#if defined(DEBUG_NE2000)
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- printf("NE2000: received len=%d\n", size);
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+ printf("NE2000: received len=%zu\n", size);
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#endif
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if (s->cmd & E8390_STOP || ne2000_buffer_full(s))
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--
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1.8.3.1
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