Author :
Ben Wagner
Date :
2024-06-20 15:00:20
Hash :b1cbcb20 Message :[ttgxvar] Avoid "applying zero offset to null pointer"
In C it is undefined behavior to do arithmetic on a null pointer, including
adding zero. When using NotoSansKhmer[wdth,wght].ttf UBSAN produces a report
like
ttgxvar.c:1052:31: runtime error: applying zero offset to null pointer
when adding zero to `varData->deltaSet` (which is null) to produce `bytes`.
Protect against all the potential issues of this kind by returning early if
`varData->regionIdxCount == 0`.
* src/truetype/ttgxvar.c (tt_var_get_item_delta): early return on no regions
Ben Wagner