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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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3
ANNOUNCE
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@ -552,6 +552,9 @@ Version 1.7.0beta32 [February 23, 2014]
support older Clang versions (Jeremy Sequoia). support older Clang versions (Jeremy Sequoia).
Use a user warning handler in contrib/gregbook/readpng2.c instead of default, Use a user warning handler in contrib/gregbook/readpng2.c instead of default,
so warnings will be put on stderr even if libpng has CONSOLE_IO disabled. so warnings will be put on stderr even if libpng has CONSOLE_IO disabled.
Added png_ptr->process_mode = PNG_READ_IDAT_MODE in 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.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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3
CHANGES
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@ -4841,6 +4841,9 @@ Version 1.7.0beta32 [February 23, 2014]
support older Clang versions (Jeremy Sequoia). support older Clang versions (Jeremy Sequoia).
Use a user warning handler in contrib/gregbook/readpng2.c instead of default, Use a user warning handler in contrib/gregbook/readpng2.c instead of default,
so warnings will be put on stderr even if libpng has CONSOLE_IO disabled. so warnings will be put on stderr even if libpng has CONSOLE_IO disabled.
Added png_ptr->process_mode = PNG_READ_IDAT_MODE in 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.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

1
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_error(png_ptr, "Missing PLTE before IDAT");
png_ptr->mode |= PNG_HAVE_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->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
if (png_ptr->push_length == 0) if (png_ptr->push_length == 0)