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[libpng15] Fixed an overflow in png_combine_row with very wide interlaced

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images.
This commit is contained in:
John Bowler
2014-12-21 16:40:33 -06:00
committed by Glenn Randers-Pehrson
parent 90238dfe7a
commit 7a6bbfd649
3 changed files with 19 additions and 13 deletions
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6
pngrutil.c
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@@ -2805,7 +2805,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
{
unsigned int pixel_depth = png_ptr->transformed_pixel_depth;
png_const_bytep sp = png_ptr->row_buf + 1;
png_uint_32 row_width = png_ptr->width;
png_alloc_size_t row_width = png_ptr->width;
unsigned int pass = png_ptr->pass;
png_bytep end_ptr = 0;
png_byte end_byte = 0;
@@ -3078,7 +3078,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
/* But don't allow this number to exceed the actual row width. */
if (bytes_to_copy > row_width)
bytes_to_copy = row_width;
bytes_to_copy = (unsigned int)/*SAFE*/row_width;
}
else /* normal row; Adam7 only ever gives us one pixel to copy. */
@@ -3256,7 +3256,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
dp += bytes_to_jump;
row_width -= bytes_to_jump;
if (bytes_to_copy > row_width)
bytes_to_copy = row_width;
bytes_to_copy = (unsigned int)/*SAFE*/row_width;
}
}