libgf_init_vmpentry: assert strlen(vmp) > 0 to guard against using vmp[-1]

Change-Id: I091e6066fd470e9e0b67a00464b5713b86d3783c
BUG: 789278
Signed-off-by: Jim Meyering <meyering@redhat.com>
Reviewed-on: http://review.gluster.com/3599
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/libglusterfsclient/src/libglusterfsclient.c b/libglusterfsclient/src/libglusterfsclient.c
index b0ae61dad..e09dc39aa 100755
--- a/libglusterfsclient/src/libglusterfsclient.c
+++ b/libglusterfsclient/src/libglusterfsclient.c
@@ -1443,7 +1443,7 @@ struct vmp_entry *
 libgf_init_vmpentry (char *vmp, glusterfs_handle_t *vmphandle)
 {
         struct vmp_entry        *entry = NULL;
-        int                     vmplen = 0;
+        size_t                  vmplen = 0;
         int                     appendslash = 0;
         int                     ret = -1;
 
@@ -1454,6 +1454,7 @@ libgf_init_vmpentry (char *vmp, glusterfs_handle_t *vmphandle)
         }
 
         vmplen = strlen (vmp);
+        assert (vmplen > 0);
         if (vmp[vmplen - 1] != '/') {
                 vmplen++;
                 appendslash = 1;