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[libpng17] Fix CMINFO bug in contrib/tools/pngfix.c

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This commit is contained in:
John Bowler
2015-11-25 16:03:47 -06:00
committed by Glenn Randers-Pehrson
parent edec44bfc4
commit 18211df70b
4 changed files with 31 additions and 15 deletions
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@@ -1031,6 +1031,12 @@ Version 1.7.0beta70 [November 25, 2015]
been zeroed when allocated was not always correct for non-interlaced
images. Revealed by pngvalid --size with a hack to make it always
use AVG.
Fixed an error in handling of bad zlib CMINFO field, found by American
Fuzzy Lop, reported by Brian Carpenter. inflate() doesn't immediately
fault a bad CMINFO field; instead a 'too far back' error happens later
(at least some times). pngfix failed to limit CMINFO to the allowed
values but then assumed that window_bits was in range, triggering an
assert. The bug is mostly harmless; the file can't be fixed.
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