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[woff2] Fix memory leak.

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Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28148

* src/sfnt/sfwoff2.c (woff2_open_font): Reject fonts that have
multiple tables with the same tag.  While not explicitly forbidden
in the OpenType specification, it is implicitly forbidden by
describing a binary search algorithm for tables that only works
reliably if table tags are unique.
This commit is contained in:
Werner Lemberg 2021-02-25 20:00:07 +01:00
parent df7fcafe6e
commit e1f364e509
2 changed files with 33 additions and 0 deletions
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14
ChangeLog
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@ -1,3 +1,17 @@
2021-02-25 Werner Lemberg <wl@gnu.org>
[woff2] Fix memory leak.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28148
* src/sfnt/sfwoff2.c (woff2_open_font): Reject fonts that have
multiple tables with the same tag. While not explicitly forbidden
in the OpenType specification, it is implicitly forbidden by
describing a binary search algorithm for tables that only works
reliably if table tags are unique.
2021-02-22 Werner Lemberg <wl@gnu.org>
* CMakeLists.txt: Update location of `LICENSE.TXT`.

19
src/sfnt/sfwoff2.c
View File

@ -2208,6 +2208,25 @@
sizeof ( WOFF2_Table ),
compare_tags );
/* reject fonts that have multiple tables with the same tag */
for ( nn = 1; nn < woff2.num_tables; nn++ )
{
FT_ULong tag = indices[nn]->Tag;
if ( tag == indices[nn - 1]->Tag )
{
FT_ERROR(( "woff2_open_font:"
" multiple tables with tag `%c%c%c%c'.\n",
(FT_Char)( tag >> 24 ),
(FT_Char)( tag >> 16 ),
(FT_Char)( tag >> 8 ),
(FT_Char)( tag ) ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
}
if ( woff2.uncompressed_size < 1 )
{
error = FT_THROW( Invalid_Table );