From db6e6a00761d62fa85ff68af8034a48b1b910d6a Mon Sep 17 00:00:00 2001
From: John Cupitt <jcupitt@gmail.com>
Date: Sun, 25 Aug 2019 11:29:37 +0100
Subject: [PATCH] catch /0 in exif read

---
 libvips/foreign/exif.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/libvips/foreign/exif.c b/libvips/foreign/exif.c
index 759e0fdc..971186e0 100644
--- a/libvips/foreign/exif.c
+++ b/libvips/foreign/exif.c
@@ -237,14 +237,25 @@ vips_exif_get_double( ExifData *ed,
 {
 	ExifRational rv;
 	ExifSRational srv;
+	double value;
 
-	if( !vips_exif_get_rational( ed, entry, component, &rv ) ) 
-		*out = (double) rv.numerator / rv.denominator;
-	else if( !vips_exif_get_srational( ed, entry, component, &srv ) ) 
-		*out = (double) srv.numerator / srv.denominator;
+	if( !vips_exif_get_rational( ed, entry, component, &rv ) ) {
+		if( rv.denominator == 0 )
+			value = 0;
+		else
+			value = (double) rv.numerator / rv.denominator;
+	}
+	else if( !vips_exif_get_srational( ed, entry, component, &srv ) ) {
+		if( srv.denominator == 0 )
+			value = 0;
+		else
+			value = (double) srv.numerator / srv.denominator;
+	}
 	else
 		return( -1 );
 
+	*out = value;
+
 	return( 0 );
 }