Blame ghostscript-9.20-cve-2017-7207.patch
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From 309eca4e0a31ea70dcc844812691439312dad091 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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---
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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 afd05bd..d52d684 100644
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--- a/base/gdevmem.c
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+++ b/base/gdevmem.c
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@@ -606,6 +606,8 @@ 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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2.9.3
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