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The mem_get_bits_rectangle function in Artifex Software, Inc. Ghostscript 9.20 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted PostScript document. Reference: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-7207 Upstream patch: http://git.ghostscript.com/?p=ghostpdl.git;h=309eca4e0a31ea70dcc844812691439312dad091 (From OE-Core rev: 0f22a27c2abd2f2dd9119681f139dd85dcb6479d) Signed-off-by: Catalin Enache <catalin.enache@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
From 0e88bee1304993668fede72498d656a2dd33a35e Mon Sep 17 00:00:00 2001
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From: Ken Sharp <ken.sharp@artifex.com>
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Date: Mon, 20 Mar 2017 09:34:11 +0000
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Subject: [PATCH] Ensure a device has raster memory, before trying to read it.
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Bug #697676 "Null pointer dereference in mem_get_bits_rectangle()"
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This is only possible by abusing/mis-using Ghostscript-specific
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language extensions, so cannot happen in a general PostScript program.
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Nevertheless, Ghostscript should not crash. So this commit checks the
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memory device to see if raster memory has been allocated, before trying
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to read from it.
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Upstream-Status: Backport
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CVE: CVE-2017-7207
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Author: Ken Sharp <ken.sharp@artifex.com>
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Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
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---
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base/gdevmem.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/base/gdevmem.c b/base/gdevmem.c
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index 41108ba..183f96d 100644
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--- a/base/gdevmem.c
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+++ b/base/gdevmem.c
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@@ -605,6 +605,8 @@ mem_get_bits_rectangle(gx_device * dev, const gs_int_rect * prect,
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GB_PACKING_CHUNKY | GB_COLORS_NATIVE | GB_ALPHA_NONE;
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return_error(gs_error_rangecheck);
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}
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+ if (mdev->line_ptrs == 0x00)
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+ return_error(gs_error_rangecheck);
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if ((w <= 0) | (h <= 0)) {
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if ((w | h) < 0)
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return_error(gs_error_rangecheck);
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--
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2.10.2
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