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| author | Ken Sharp <ken.sharp@artifex.com> | 2017-03-20 09:34:11 +0000 |
|---|---|---|
| committer | Ken Sharp <ken.sharp@artifex.com> | 2017-03-20 09:34:11 +0000 |
| commit | 309eca4e0a31ea70dcc844812691439312dad091 (patch) | |
| tree | 3222116ec39ee0d3382a6a8d7fec640a6b07d55a | |
| parent | dd5da2cb3e08398ac6d86598b36b00994d058308 (diff) | |
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.
| -rw-r--r-- | base/gdevmem.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/base/gdevmem.c b/base/gdevmem.c index afd05bdb3..d52d68414 100644 --- a/base/gdevmem.c +++ b/base/gdevmem.c @@ -606,6 +606,8 @@ 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); |
