From aac17486152b90de3f5d22cca1b30de1be6333fb Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Sun, 19 Jul 2020 14:37:38 +0200
Subject: [PATCH] Explicitly cast to unsigned int before left-shifting

To avoid potential signed integer overflow (undefined behavior), as
implicit integer promotion means the operand becomes a (signed) int.
---
 libvips/foreign/radiance.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libvips/foreign/radiance.c b/libvips/foreign/radiance.c
index c9889b14..431f4c5a 100644
--- a/libvips/foreign/radiance.c
+++ b/libvips/foreign/radiance.c
@@ -544,9 +544,9 @@ scanline_read_old( VipsSbuf *sbuf, COLR *scanline, int width )
 		if( scanline[0][RED] == 1 &&
 			scanline[0][GRN] == 1 &&
 			scanline[0][BLU] == 1 ) {
-			int i;
+			guint i;
 
-			for( i = scanline[0][EXP] << rshift; 
+			for( i = ((guint32) scanline[0][EXP] << rshift); 
 				i > 0 && width > 0; i-- ) {
 				copycolr( scanline[0], scanline[-1] );
 				scanline += 1;