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Validate cache more carefully 

Reject caches when FcPattern isn't a constant.
This is usually unlikely to happen but reported.
I've decided to add more validation since this isn't reproducible
and easy to have a workaround rather than investigating 'why'.

https://bugs.freedesktop.org/show_bug.cgi?id=103237
This commit is contained in:
Akira TAGOH 2017-11-14 20:55:24 +09:00
parent 12eb7be466
commit 2ed243f323
1 changed files with 2 additions and 1 deletions
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3
src/fccache.c
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@ -646,7 +646,8 @@ FcCacheOffsetsValid (FcCache *cache)
(char *) font > end - sizeof (FcFontSet) || (char *) font > end - sizeof (FcFontSet) ||
font->elts_offset < 0 || font->elts_offset < 0 ||
font->elts_offset > end - (char *) font || font->elts_offset > end - (char *) font ||
font->num > (end - (char *) font - font->elts_offset) / sizeof (FcPatternElt)) font->num > (end - (char *) font - font->elts_offset) / sizeof (FcPatternElt) ||
!FcRefIsConst (&font->ref))
return FcFalse; return FcFalse;