Fix CVE-2016-6328:

https://bugzilla.redhat.com/show_bug.cgi?id=1366239
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6328

Patch copied from upstream source repository:

https://github.com/libexif/libexif/commit/41bd04234b104312f54d25822f68738ba8d7133d

From 41bd04234b104312f54d25822f68738ba8d7133d Mon Sep 17 00:00:00 2001
From: Marcus Meissner <marcus@jet.franken.de>
Date: Tue, 25 Jul 2017 23:44:44 +0200
Subject: [PATCH] fixes some (not all) buffer overreads during decoding pentax
 makernote entries.

This should fix:
https://sourceforge.net/p/libexif/bugs/125/ CVE-2016-6328
---
 libexif/pentax/mnote-pentax-entry.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/libexif/pentax/mnote-pentax-entry.c b/libexif/pentax/mnote-pentax-entry.c
index d03d159..ea0429a 100644
--- a/libexif/pentax/mnote-pentax-entry.c
+++ b/libexif/pentax/mnote-pentax-entry.c
@@ -425,24 +425,34 @@ mnote_pentax_entry_get_value (MnotePentaxEntry *entry,
 		case EXIF_FORMAT_SHORT:
 		  {
 			const unsigned char *data = entry->data;
-		  	size_t k, len = strlen(val);
+		  	size_t k, len = strlen(val), sizeleft;
+
+			sizeleft = entry->size;
 		  	for(k=0; k<entry->components; k++) {
+				if (sizeleft < 2)
+					break;
 				vs = exif_get_short (data, entry->order);
 				snprintf (val+len, maxlen-len, "%i ", vs);
 				len = strlen(val);
 				data += 2;
+				sizeleft -= 2;
 			}
 		  }
 		  break;
 		case EXIF_FORMAT_LONG:
 		  {
 			const unsigned char *data = entry->data;
-		  	size_t k, len = strlen(val);
+		  	size_t k, len = strlen(val), sizeleft;
+
+			sizeleft = entry->size;
 		  	for(k=0; k<entry->components; k++) {
+				if (sizeleft < 4)
+					break;
 				vl = exif_get_long (data, entry->order);
 				snprintf (val+len, maxlen-len, "%li", (long int) vl);
 				len = strlen(val);
 				data += 4;
+				sizeleft -= 4;
 			}
 		  }
 		  break;
@@ -455,5 +465,5 @@ mnote_pentax_entry_get_value (MnotePentaxEntry *entry,
 		break;
 	}
 
-	return (val);
+	return val;
 }
-- 
2.16.0

