| From 0e88bee1304993668fede72498d656a2dd33a35e Mon Sep 17 00:00:00 2001 |
| From: Ken Sharp <ken.sharp@artifex.com> |
| Date: Mon, 20 Mar 2017 09:34:11 +0000 |
| Subject: [PATCH] Ensure a device has raster memory, before trying to read it. |
| |
| Bug #697676 "Null pointer dereference in mem_get_bits_rectangle()" |
| |
| This is only possible by abusing/mis-using Ghostscript-specific |
| language extensions, so cannot happen in a general PostScript program. |
| |
| Nevertheless, Ghostscript should not crash. So this commit checks the |
| memory device to see if raster memory has been allocated, before trying |
| to read from it. |
| |
| Upstream-Status: Backport |
| CVE: CVE-2017-7207 |
| |
| Author: Ken Sharp <ken.sharp@artifex.com> |
| Signed-off-by: Catalin Enache <catalin.enache@windriver.com> |
| --- |
| base/gdevmem.c | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| diff --git a/base/gdevmem.c b/base/gdevmem.c |
| index 41108ba..183f96d 100644 |
| --- a/base/gdevmem.c |
| +++ b/base/gdevmem.c |
| @@ -605,6 +605,8 @@ mem_get_bits_rectangle(gx_device * dev, const gs_int_rect * prect, |
| GB_PACKING_CHUNKY | GB_COLORS_NATIVE | GB_ALPHA_NONE; |
| return_error(gs_error_rangecheck); |
| } |
| + if (mdev->line_ptrs == 0x00) |
| + return_error(gs_error_rangecheck); |
| if ((w <= 0) | (h <= 0)) { |
| if ((w | h) < 0) |
| return_error(gs_error_rangecheck); |
| -- |
| 2.10.2 |
| |