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Fix potential vulnerability in cloned code #7

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Fix potential vulnerability in cloned code #7

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9 changes: 6 additions & 3 deletions Libs/lpng163/pngrutil.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3158,10 +3158,13 @@ png_check_chunk_length(png_const_structrp png_ptr, const png_uint_32 length)
else
{
size_t row_factor =
(png_ptr->width * png_ptr->channels * (png_ptr->bit_depth > 8? 2: 1)
+ 1 + (png_ptr->interlaced? 6: 0));
(size_t)png_ptr->width
* (size_t)png_ptr->channels
* (png_ptr->bit_depth > 8? 2: 1)
+ 1
+ (png_ptr->interlaced? 6: 0);
if (png_ptr->height > PNG_UINT_32_MAX/row_factor)
limit=PNG_UINT_31_MAX;
limit = PNG_UINT_31_MAX;
else
limit = png_ptr->height * row_factor;
limit += 6 + 5*(limit/32566+1); /* zlib+deflate overhead */
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