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authorKen Sharp <ken.sharp@artifex.com>2017-03-20 09:34:11 +0000
committerKen Sharp <ken.sharp@artifex.com>2017-03-20 09:34:11 +0000
commit309eca4e0a31ea70dcc844812691439312dad091 (patch)
tree3222116ec39ee0d3382a6a8d7fec640a6b07d55a
parentdd5da2cb3e08398ac6d86598b36b00994d058308 (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.c2
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);