d0de5649d5
GraphicsMagick through 1.3.35 has a heap-based buffer overflow in ReadMNGImage in coders/png.c. Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
79 lines
3.2 KiB
Diff
79 lines
3.2 KiB
Diff
# HG changeset patch
|
|
# User Bob Friesenhahn <bfriesen@GraphicsMagick.org>
|
|
# Date 1590851896 18000
|
|
# Sat May 30 10:18:16 2020 -0500
|
|
# Node ID 50395430a37188d0d197e71bd85ed6dd0f649ee3
|
|
# Parent 4917a4242fc0a12f2f6baa10f1c5a9b3e68c20dd
|
|
MNG: Fix small heap overwrite or assertion if magnifying and image to be magnified has rows or columns == 1.
|
|
|
|
[Retrieved (and updated to remove ChangeLog and version changes) from:
|
|
https://sourceforge.net/p/graphicsmagick/code/ci/50395430a37188d0d197e71bd85ed6dd0f649ee3]
|
|
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
|
|
|
|
diff -r 4917a4242fc0 -r 50395430a371 coders/png.c
|
|
--- a/coders/png.c Fri May 01 13:49:13 2020 -0500
|
|
+++ b/coders/png.c Sat May 30 10:18:16 2020 -0500
|
|
@@ -5304,7 +5304,7 @@
|
|
if (logging)
|
|
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
|
|
"MAGN chunk (%lu bytes): "
|
|
- "First_magnified_object_id=%u, Last_magnified_object_id=%u, "
|
|
+ "First_magnified_object_id=%u, Las t_magnified_object_id=%u, "
|
|
"MB=%u, ML=%u, MR=%u, MT=%u, MX=%u, MY=%u, "
|
|
"X_method=%u, Y_method=%u",
|
|
length,
|
|
@@ -5679,6 +5679,8 @@
|
|
/*
|
|
If magnifying and a supported method is requested then
|
|
magnify the image.
|
|
+
|
|
+ http://www.libpng.org/pub/mng/spec/mng-1.0-20010209-pdg.html#mng-MAGN
|
|
*/
|
|
if (((mng_info->magn_methx > 0) && (mng_info->magn_methx <= 5)) &&
|
|
((mng_info->magn_methy > 0) && (mng_info->magn_methy <= 5)))
|
|
@@ -5689,7 +5691,28 @@
|
|
|
|
if (logging)
|
|
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
|
|
- " Processing MNG MAGN chunk");
|
|
+ " Processing MNG MAGN chunk: MB=%u, ML=%u,"
|
|
+ " MR=%u, MT=%u, MX=%u, MY=%u,"
|
|
+ " X_method=%u, Y_method=%u",
|
|
+ mng_info->magn_mb,mng_info->magn_ml,
|
|
+ mng_info->magn_mr,mng_info->magn_mt,
|
|
+ mng_info->magn_mx,mng_info->magn_my,
|
|
+ mng_info->magn_methx,
|
|
+ mng_info->magn_methy);
|
|
+
|
|
+ /*
|
|
+ If the image width is 1, then X magnification is done
|
|
+ by simple pixel replication.
|
|
+ */
|
|
+ if (image->columns == 1)
|
|
+ mng_info->magn_methx = 1;
|
|
+
|
|
+ /*
|
|
+ If the image height is 1, then Y magnification is done
|
|
+ by simple pixel replication.
|
|
+ */
|
|
+ if (image->rows == 1)
|
|
+ mng_info->magn_methy = 1;
|
|
|
|
if (mng_info->magn_methx == 1)
|
|
{
|
|
@@ -5734,12 +5757,10 @@
|
|
Image
|
|
*large_image;
|
|
|
|
- int
|
|
- yy;
|
|
-
|
|
long
|
|
m,
|
|
- y;
|
|
+ y,
|
|
+ yy;
|
|
|
|
register long
|
|
x;
|