1 files changed, 5 insertions, 2 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ddefddeffd06..5299effa6f7d 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4231,16 +4231,19 @@ build_unc_path_to_root(const struct smb_vol *vol,
                 strlen(vol->prepath) + 1 : 0;
         unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
 
+        if (unc_len > MAX_TREE_SIZE)
+                return ERR_PTR(-EINVAL);
+
         full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
         if (full_path == NULL)
                 return ERR_PTR(-ENOMEM);
 
-        strncpy(full_path, vol->UNC, unc_len);
+        memcpy(full_path, vol->UNC, unc_len);
         pos = full_path + unc_len;
 
         if (pplen) {
                 *pos = CIFS_DIR_SEP(cifs_sb);
-                strncpy(pos + 1, vol->prepath, pplen);
+                memcpy(pos + 1, vol->prepath, pplen);
                 pos += pplen;
         }