Commit 6d62076ae5d000612202aeae99c71ce27fdb2fb1
2022-08-30T15:00:37
[sfnt] Pointer sanity checks before reading layer info in 'COLR' v0 * src/sfnt/ttcolr.c (tt_face_get_colr_layer): Check that the pointer to read from is within the 'COLR' table. Reported as https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=50633
diff --git a/src/sfnt/ttcolr.c b/src/sfnt/ttcolr.c
index 1277bbd..ad0f127 100644
--- a/src/sfnt/ttcolr.c
+++ b/src/sfnt/ttcolr.c
@@ -481,7 +481,9 @@
iterator->p = colr->layers + offset;
}
- if ( iterator->layer >= iterator->num_layers )
+ if ( iterator->layer >= iterator->num_layers ||
+ iterator->p < colr->layers ||
+ iterator->p >= ( (FT_Byte*)colr->table + colr->table_size ) )
return 0;
*aglyph_index = FT_NEXT_USHORT( iterator->p );