Avoid null pointer dereference in reencode().

Returning "*txt" if "txt" is a null pointer is a bad thing. Spotted with
clang-analyzer.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/parsing.c b/parsing.c
index c9e4350..151c0fe 100644
--- a/parsing.c
+++ b/parsing.c
@@ -94,25 +94,28 @@ char *parse_user(char *t, char **name, char **email, unsigned long *date)
 		p++;
 	}
 	return p;
 }
 
 #ifdef NO_ICONV
 #define reencode(a, b, c)
 #else
 const char *reencode(char **txt, const char *src_enc, const char *dst_enc)
 {
 	char *tmp;
 
-	if (!txt || !*txt || !src_enc || !dst_enc)
+	if (!txt)
+		return NULL;
+
+	if (!*txt || !src_enc || !dst_enc)
 		return *txt;
 
 	/* no encoding needed if src_enc equals dst_enc */
 	if(!strcasecmp(src_enc, dst_enc))
 		return *txt;
 
 	tmp = reencode_string(*txt, dst_enc, src_enc);
 	if (tmp) {
 		free(*txt);
 		*txt = tmp;
 	}
 	return *txt;