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[libpng17] Added png_ptr->process_mode = PNG_READ_IDAT_MODE in

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png_push_read_chunk after recognizing the IDAT chunk, which avoids an
infinite loop while reading a datastream whose first IDAT chunk is of
zero-length.
This commit is contained in:
Glenn Randers-Pehrson
2014-02-23 10:09:57 -06:00
parent 4526f546ba
commit 713a20c57d
3 changed files with 7 additions and 0 deletions
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pngpread.c
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@@ -234,6 +234,7 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
png_error(png_ptr, "Missing PLTE before IDAT");
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->process_mode = PNG_READ_IDAT_MODE;
if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
if (png_ptr->push_length == 0)