opj_int_ceildiv(): fix int32 overflow. Fixes https://bugs.chromium.or…

…g/p/oss-fuzz/issues/detail?id=2494. Credit to OSS Fuzz
uclouvain · Jul 28, 2017 · d6654d9 · d6654d9
1 parent 361c450
commit d6654d9
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/lib/openjp2/opj_intmath.h b/src/lib/openjp2/opj_intmath.h
@@ -129,7 +129,7 @@ Divide an integer and round upwards
 static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b)
 {
     assert(b);
-    return (a + b - 1) / b;
+    return (OPJ_INT32)(((OPJ_INT64)a + b - 1) / b);
 }
 
 /**