Don't segfault if the first word is the empty string.

1 files changed, 4 insertions, 2 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 2e65f0b6d..9134251f5 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1298,7 +1298,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
         int cnt, pathc;
         const char *s;
         char *dest;
-        for (cnt=1, s=src; *s; s++) {
+        for (cnt=1, s=src; s && *s; s++) {
                 if (*s == '\\') s++;
                 cnt++;
         }
@@ -1315,7 +1315,7 @@ static int globhack(const char *src, int flags, glob_t *pglob)
         if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
         pglob->gl_pathv[pathc-1]=dest;
         pglob->gl_pathv[pathc]=NULL;
-        for (s=src; *s; s++, dest++) {
+        for (s=src; s && *s; s++, dest++) {
                 if (*s == '\\') s++;
                 *dest = *s;
         }
@@ -1482,6 +1482,8 @@ int reserved_word(o_string *dest, struct p_context *ctx)
                 { "done",  RES_DONE,  FLAG_END  }
         };
         struct reserved_combo *r;
+        if (dest->data == NULL)
+                return 0;
         for (r=reserved_list;
 #define NRES sizeof(reserved_list)/sizeof(struct reserved_combo)
                 r<reserved_list+NRES; r++) {