From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 28 Jul 2017 20:15:47 +0000 (+0200)
Subject: opj_int_ceildiv(): fix int32 overflow. Fixes https://bugs.chromium.org/p/oss-fuzz... 
X-Git-Tag: v2.2.0~41
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d6654d906c1ae66590b6d600458a91f1ee923de5;p=openjpeg

opj_int_ceildiv(): fix int32 overflow. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2494. Credit to OSS Fuzz
---

diff --git a/src/lib/openjp2/opj_intmath.h b/src/lib/openjp2/opj_intmath.h
index 03a446f1..64c87ed9 100644
--- 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);
 }
 
 /**