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Underflow protection in hb_vector_t

This commit is contained in:
Behdad Esfahbod 2018-05-24 13:38:46 -07:00
parent f83e992c8b
commit 31c4236d96
1 changed files with 7 additions and 4 deletions
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11
src/hb-private.hh
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@ -685,8 +685,9 @@ struct hb_vector_t
return true; return true;
} }
inline bool resize (unsigned int size) inline bool resize (int size_)
{ {
unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
if (!alloc (size)) if (!alloc (size))
return false; return false;
@ -696,6 +697,7 @@ struct hb_vector_t
inline void pop (void) inline void pop (void)
{ {
if (!len) return;
len--; len--;
} }
@ -709,10 +711,11 @@ struct hb_vector_t
len--; len--;
} }
inline void shrink (unsigned int l) inline void shrink (int size_)
{ {
if (l < len) unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
len = l; if (size < len)
len = size;
} }
template <typename T> template <typename T>