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From b18831e53e64414ebd35419fb8dffd51e8ec46f7 Mon Sep 17 00:00:00 2001
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From: Sergio Lopez Pascual <slp@redhat.com>
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Date: Mon, 15 Apr 2019 09:09:30 +0200
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Subject: [PATCH] device_tree: Fix integer overflowing in load_device_tree()
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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: Sergio Lopez Pascual <slp@redhat.com>
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Message-id: <20190415090930.27086-2-slp@redhat.com>
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Patchwork-id: 85657
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O-Subject: [RHEL-7.6.z qemu-kvm-ma PATCH 1/1] device_tree: Fix integer overflowing in load_device_tree()
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Bugzilla: 1693112
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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From: Markus Armbruster <armbru@redhat.com>
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If the value of get_image_size() exceeds INT_MAX / 2 - 10000, the
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computation of @dt_size overflows to a negative number, which then
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gets converted to a very large size_t for g_malloc0() and
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load_image_size(). In the (fortunately improbable) case g_malloc0()
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succeeds and load_image_size() survives, we'd assign the negative
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number to *sizep. What that would do to the callers I can't say, but
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it's unlikely to be good.
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Fix by rejecting images whose size would overflow.
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Reported-by: Kurtis Miller <kurtis.miller@nccgroup.com>
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Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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Message-Id: <20190409174018.25798-1-armbru@redhat.com>
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(cherry picked from commit 065e6298a75164b4347682b63381dbe752c2b156)
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Signed-off-by: Sergio Lopez <slp@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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device_tree.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/device_tree.c b/device_tree.c
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index 19458b3..2457f58 100644
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--- a/device_tree.c
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+++ b/device_tree.c
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@@ -84,6 +84,10 @@ void *load_device_tree(const char *filename_path, int *sizep)
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filename_path);
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goto fail;
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}
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+ if (dt_size > INT_MAX / 2 - 10000) {
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+ error_report("Device tree file '%s' is too large", filename_path);
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+ goto fail;
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+ }
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/* Expand to 2x size to give enough room for manipulation. */
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dt_size += 10000;
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--
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1.8.3.1
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