From f6334d9d32437ef13dc902f0a88a2be0063d9d1c Mon Sep 17 00:00:00 2001
From: Marcus Meissner <marcus@jet.franken.de>
Date: Thu, 25 Feb 2021 08:31:53 +0100
Subject: [PATCH] added empty strign check, which would lead to NULL ptr
 deref/crash in exif XML display. fixes
 https://github.com/libexif/exif/issues/4

---
 exif/actions.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/exif/actions.c b/exif/actions.c
index ed245df..123c064 100644
--- a/exif/actions.c
+++ b/exif/actions.c
@@ -661,6 +661,8 @@ escape_xml(const char *text)
 	char *out;
 	size_t len;
 
+	if (!strlen(text)) return "empty string";
+
 	for (out=escaped, len=0; *text; ++len, ++out, ++text) {
 		/* Make sure there's plenty of room for a quoted character */
 		if ((len + 8) > escaped_size) {