1 files changed, 4 insertions, 0 deletions
diff --git a/c/enc/hash.h b/c/enc/hash.h
index ba9b0d8..9533b05 100644
--- a/c/enc/hash.h
+++ b/c/enc/hash.h
@@ -548,6 +548,8 @@ static BROTLI_INLINE void FindCompoundDictionaryMatch(
     source = (const uint8_t*)BROTLI_UNALIGNED_LOAD_PTR((const uint8_t**)tail);
   }
 
+  BROTLI_DCHECK(cur_ix_masked + max_length <= ring_buffer_mask);
+
   for (i = 0; i < 4; ++i) {
     const size_t distance = (size_t)distance_cache[i];
     size_t offset;
@@ -657,6 +659,8 @@ static BROTLI_INLINE size_t FindAllCompoundDictionaryMatches(
     source = (const uint8_t*)BROTLI_UNALIGNED_LOAD_PTR((const uint8_t**)tail);
   }
 
+  BROTLI_DCHECK(cur_ix_masked + max_length <= ring_buffer_mask);
+
   while (item == 0) {
     size_t offset;
     size_t distance;