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[pshinter] Avoid accessing uninitialized zone. 

The `normal_top.count` may be 0, implying no `normal_top.zones` exist.
The code must not access these (non-existent) `normal_top.zones`.

* src/pshinter/pshalgo.c (ps_hints_apply): Do not assume that
`normal_top.zones[0]` is initialized. Test `normal_top.count`
before using `normal_top.zones[0]`. Do not rescale if there are no
`zones`.

Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43675
This commit is contained in:
Ben Wagner 2022-01-15 17:08:18 -05:00
parent edd4fedc54
commit 5e227133c1
1 changed files with 7 additions and 4 deletions
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11
src/pshinter/pshalgo.c
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@ -2110,14 +2110,17 @@
FT_Fixed old_x_scale = x_scale;
FT_Fixed old_y_scale = y_scale;
FT_Fixed scaled;
FT_Fixed fitted;
FT_Fixed scaled = 0;
FT_Fixed fitted = 0;
FT_Bool rescale = FALSE;
scaled = FT_MulFix( globals->blues.normal_top.zones->org_ref, y_scale );
fitted = FT_PIX_ROUND( scaled );
if ( globals->blues.normal_top.count )
{
scaled = FT_MulFix( globals->blues.normal_top.zones->org_ref, y_scale );
fitted = FT_PIX_ROUND( scaled );
}
if ( fitted != 0 && scaled != fitted )
{