Space allocated for exec env may be one byte short

Signed-off-by: Steve Bennett <steveb@workware.net.au>
Reported-by: af123 <jimdevel@hummypkg.org.uk>

1 files changed, 2 insertions, 3 deletions

diff --git a/jim-exec.c b/jim-exec.c
index 7da97dc..e22c220 100644
--- a/jim-exec.c
+++ b/jim-exec.c
@@ -255,12 +255,11 @@ static char **JimBuildEnv(Jim_Interp *interp)
     if (num % 2) {
         num--;
     }
-    size = Jim_Length(objPtr);
     /* We need one \0 and one equal sign for each element.
      * A list has at least one space for each element except the first.
-     * We only need one extra char for the extra null terminator.
+     * We need one extra char for the extra null terminator and one for the equal sign.
      */
-    size++;
+    size = Jim_Length(objPtr) + 2;
 
     envptr = Jim_Alloc(sizeof(*envptr) * (num / 2 + 1) + size);
     envdata = (char *)&envptr[num / 2 + 1];