Avoid a segfault (detected by Fabio Ferrari

<fabio.ferrari@digitro.com.br> in the wget applet) when
concat_path_file() or last_char_is() were fed a NULL.
 -Erik


git-svn-id: svn://busybox.net/trunk/busybox@3027 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 4 insertions, 1 deletions

diff --git a/libbb/last_char_is.c b/libbb/last_char_is.c
index a95e57c35..4e2ee92ed 100644
--- a/libbb/last_char_is.c
+++ b/libbb/last_char_is.c
@@ -28,7 +28,10 @@
  */
 char * last_char_is(const char *s, int c)
 {
-        char *sret  = (char *)s+strlen(s)-1;
+        char *sret;
+        if (!s)
+            return NULL;
+        sret  = (char *)s+strlen(s)-1;
         if (sret>=s && *sret == c) { 
                 return sret;
         } else {