shaper: fix reallocation

Update the variable that tracks the allocated size. This potentially
improves performance and avoid some side effects, which lead to
undefined behavior in some cases.

Fixes fuzzer test case id:000051,sig:11,sync:fuzzer3,src:004221.

diff --git a/libass/ass_shaper.c b/libass/ass_shaper.c
index 2707b2362e44d7beae2a196437f983bb4b4c7abe..5f24c5a955fdec1abb5eaeafa7b313f4845d7b77 100644 (file)
--- a/libass/ass_shaper.c
+++ b/libass/ass_shaper.c
@@ -100,6 +100,7 @@ static bool check_allocations(ASS_Shaper *shaper, size_t new_size)
             !ASS_REALLOC_ARRAY(shaper->emblevels, new_size) ||
             !ASS_REALLOC_ARRAY(shaper->cmap, new_size))
             return false;
+        shaper->n_glyphs = new_size;
     }
     return true;
 }