Return NULL in strlower_talloc if src is NULL

Prevents strlower_talloc from segfaulting if you pass it a NULL string.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/lib/util/charset/util_unistr.c b/lib/util/charset/util_unistr.c
index 045aa4a3e3f4922a4df2c86d13e33425b5d05ae1..f8207261c5fbb9fbd04359c318d3f8381a2cb651 100644 (file)
--- a/lib/util/charset/util_unistr.c
+++ b/lib/util/charset/util_unistr.c
@@ -430,6 +430,10 @@ _PUBLIC_ char *strlower_talloc(TALLOC_CTX *ctx, const char *src)
        char *dest;
        struct smb_iconv_convenience *iconv_convenience = get_iconv_convenience();
 
+       if(src == NULL) {
+               return NULL;
+       }
+
        /* this takes advantage of the fact that upper/lower can't
           change the length of a character by more than 1 byte */
        dest = talloc_array(ctx, char, 2*(strlen(src))+1);