diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 7c2ecbb17f54..f31da2647d04 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3263,7 +3263,7 @@ smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
 	struct kvec close_iov[1];
 	struct smb2_ioctl_rsp *ioctl_rsp;
 	struct reparse_data_buffer *reparse_buf;
-	u32 plen;
+	u32 off, count, len;
 
 	cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
 
@@ -3343,16 +3343,22 @@ smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
 	 */
 	if (rc == 0) {
 		/* See MS-FSCC 2.3.23 */
+		off = le32_to_cpu(ioctl_rsp->OutputOffset);
+		count = le32_to_cpu(ioctl_rsp->OutputCount);
+		if (check_add_overflow(off, count, &len) ||
+		    len > rsp_iov[1].iov_len) {
+			cifs_tcon_dbg(VFS, "%s: invalid ioctl: off=%d count=%d\n",
+				      __func__, off, count);
+			rc = -EIO;
+			goto query_rp_exit;
+		}
 
-		reparse_buf = (struct reparse_data_buffer *)
-			((char *)ioctl_rsp +
-			 le32_to_cpu(ioctl_rsp->OutputOffset));
-		plen = le32_to_cpu(ioctl_rsp->OutputCount);
-
-		if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
-		    rsp_iov[1].iov_len) {
-			cifs_tcon_dbg(FYI, "srv returned invalid ioctl len: %d\n",
-				 plen);
+		reparse_buf = (void *)((u8 *)ioctl_rsp + off);
+		len = sizeof(*reparse_buf);
+		if (count < len ||
+		    count < le16_to_cpu(reparse_buf->ReparseDataLength) + len) {
+			cifs_tcon_dbg(VFS, "%s: invalid ioctl: off=%d count=%d\n",
+				      __func__, off, count);
 			rc = -EIO;
 			goto query_rp_exit;
 		}