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http://openwall.com/lists/oss-security/2017/08/28/5
http://hg.code.sf.net/p/graphicsmagick/code/rev/3bbf7a13643d
some changes were made to make the patch apply
# HG changeset patch
# User Bob Friesenhahn <bfriesen@GraphicsMagick.org>
# Date 1503268616 18000
# Node ID 3bbf7a13643df3be76b0e19088a6cc632eea2072
# Parent 83a5b946180835f260bcb91e3d06327a8e2577e3
PNM: For binary formats, verify sufficient backing file data before memory request.
diff -r 83a5b9461808 -r 3bbf7a13643d coders/pnm.c
--- a/coders/pnm.c Sun Aug 20 17:31:35 2017 -0500
+++ b/coders/pnm.c Sun Aug 20 17:36:56 2017 -0500
@@ -569,7 +569,7 @@
(void) LogMagickEvent(CoderEvent,GetMagickModule(),"Colors: %u",
image->colors);
}
- number_pixels=image->columns*image->rows;
+ number_pixels=MagickArraySize(image->columns,image->rows);
if (number_pixels == 0)
ThrowReaderException(CorruptImageError,NegativeOrZeroImageSize,image);
if (image->storage_class == PseudoClass)
@@ -858,14 +858,14 @@
if (1 == bits_per_sample)
{
/* PBM */
- bytes_per_row=((image->columns+7) >> 3);
+ bytes_per_row=((image->columns+7U) >> 3);
import_options.grayscale_miniswhite=MagickTrue;
quantum_type=GrayQuantum;
}
else
{
/* PGM & XV_332 */
- bytes_per_row=((bits_per_sample+7)/8)*image->columns;
+ bytes_per_row=MagickArraySize(((bits_per_sample+7U)/8U),image->columns);
if (XV_332_Format == format)
{
quantum_type=IndexQuantum;
@@ -878,7 +878,8 @@
}
else
{
- bytes_per_row=(((bits_per_sample+7)/8)*samples_per_pixel)*image->columns;
+ bytes_per_row=MagickArraySize((((bits_per_sample+7)/8)*samples_per_pixel),
+ image->columns);
if (3 == samples_per_pixel)
{
/* PPM */
@@ -915,6 +916,28 @@
is_monochrome=MagickFalse;
}
}
+
+ /* Validate file size before allocating memory */
+ if (BlobIsSeekable(image))
+ {
+ const magick_off_t file_size = GetBlobSize(image);
+ const magick_off_t current_offset = TellBlob(image);
+ if ((file_size > 0) &&
+ (current_offset > 0) &&
+ (file_size > current_offset))
+ {
+ const magick_off_t remaining = file_size-current_offset;
+ const magick_off_t needed = (magick_off_t) image->rows *
+ (magick_off_t) bytes_per_row;
+ if ((remaining < (magick_off_t) bytes_per_row) ||
+ (remaining < needed))
+ {
+ ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
+ image->filename);
+ break;
+ }
+ }
+ }
scanline_set=AllocateThreadViewDataArray(image,exception,bytes_per_row,1);
if (scanline_set == (ThreadViewDataSet *) NULL)