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
@@ -82,49 +82,52 @@ char *parse_user(char *t, char **name, char **email, unsigned long *date)
                         mode++;
                 } else if (mode == 2 && *p == '\n') {
                         *email = substr(t, p);
                         p++;
                         break;
                 } else if (mode == 3 && isdigit(*p)) {
                         *date = atol(p);
                         mode++;
                 } else if (*p == '\n') {
                         p++;
                         break;
                 }
                 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;
 }
 #endif
 
 struct commitinfo *cgit_parse_commit(struct commit *commit)
 {
         struct commitinfo *ret;
         char *p = commit->buffer, *t = commit->buffer;
 
         ret = xmalloc(sizeof(*ret));
         ret->commit = commit;
         ret->author = NULL;
         ret->author_email = NULL;