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[libpng16] Relocate the iCCP length test to a point after reading the keyword

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Glenn Randers-Pehrson
2017-08-06 08:25:56 -05:00
parent 8ed418b042
commit 099558d100
3 changed files with 17 additions and 12 deletions
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23
pngrutil.c
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@@ -1380,17 +1380,7 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
* chunk is just ignored, so does not invalidate the color space. An
* alternative is to set the 'invalid' flags at the start of this routine
* and only clear them in they were not set before and all the tests pass.
* The minimum 'zlib' stream is assumed to be just the 2 byte header,
* 5 bytes minimum 'deflate' stream, and the 4 byte checksum. The keyword
* must be at least one character and there is a terminator (0) byte and
* the compression method.
*/
if (length < 14)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too short");
return;
}
/* If a colorspace error has already been output skip this chunk */
if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
@@ -1417,6 +1407,19 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
png_crc_read(png_ptr, (png_bytep)keyword, read_length);
length -= read_length;
/* The minimum 'zlib' stream is assumed to be just the 2 byte header,
* 5 bytes minimum 'deflate' stream, and the 4 byte checksum. The keyword
* must be at least one character and there is a terminator (0) byte and
* the compression method.
*/
if (length < 14)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too short");
return;
}
keyword_length = 0;
while (keyword_length < 80 && keyword_length < read_length &&
keyword[keyword_length] != 0)