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[morx] Fix memory access issues with unsafe_to_break

This commit is contained in:
Behdad Esfahbod 2018-10-06 21:31:44 +02:00
parent f58c517589
commit 7ee50af836
1 changed files with 5 additions and 3 deletions
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8
src/hb-aat-layout-common.hh
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@ -561,15 +561,17 @@ struct StateTableDriver
break;
/* Unsafe-to-break before this if not in state 0, as things might
* go differently if we start from state 0 here. */
if (state && buffer->idx)
* go differently if we start from state 0 here.
*
* Ugh. The indexing here is ugly... */
if (state && buffer->backtrack_len () && buffer->idx < buffer->len)
{
/* If there's no action and we're just epsilon-transitioning to state 0,
* safe to break. */
if (c->is_actionable (this, entry) ||
!(entry->newState == StateTable<EntryData>::STATE_START_OF_TEXT &&
entry->flags == context_t::DontAdvance))
buffer->unsafe_to_break (buffer->idx - 1, buffer->idx + 1);
buffer->unsafe_to_break_from_outbuffer (buffer->backtrack_len () - 1, buffer->idx + 1);
}
/* Unsafe-to-break if end-of-text would kick in here. */