hush: fix fallout from tweaking ${var:START:LEN} code

function                                             old     new   delta
expand_one_var                                      2344    2353      +9

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 6b8f1c88c..9403e1f6c 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -6617,7 +6617,7 @@ static NOINLINE int expand_one_var(o_string *output, int n,
                         exp_word = p;
                         p = strchr(p, SPECIAL_VAR_SYMBOL);
                         *p = '\0';
-                        vallen = strlen(val);
+                        vallen = val ? strlen(val) : 0;
                         if (beg < 0) {
                                 /* negative beg counts from the end */
                                 beg = (arith_t)vallen + beg;