[Git][freetype/freetype][master] [gzip] Handle inflate returning Z_NEED_DICT

[Ben Wagner (@bungeman)]

Ben Wagner pushed to branch master at FreeType / FreeType

Commits:

• 8bb7722a
  by Ben Wagner at 2022-06-14T04:49:29+00:00

  [gzip] Handle inflate returning Z_NEED_DICT
  
  When `inflate` returns `Z_NEED_DICT` this is currently not reported as
  an error and callers may assume that the decompression succeeded when it
  did not. In particular, a compressed table in a woff file may not
  actually be decompressed and written as expected, leaving the backing
  memory for the expanded table uninitialized.
  
  * src/gzlip/ftgzip.c (FT_Gzip_Uncompress): treat `Z_NEED_DICT` as
  indicating invalid data since there is no means to provide a dictionary.
  
  Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1335712
  

1 changed file:

• src/gzip/ftgzip.c

Changes:

src/gzip/ftgzip.c

---

...	...	@@ -790,6 +790,9 @@
790	790	if ( err == Z_DATA_ERROR )
791	791	return FT_THROW( Invalid_Table );
792	792
	793	+ if ( err == Z_NEED_DICT )
	794	+ return FT_THROW( Invalid_Table );
	795	+
793	796	return FT_Err_Ok;
794	797	}
795	798

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