[PATCH 4.11 072/114] cifs: fix leak in FSCTL_ENUM_SNAPS response handling

[Greg Kroah-Hartman]

4.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Disseldorp <dd...@suse.de>

commit 0e5c795592930d51fd30d53a2e7b73cba022a29b upstream.

The server may respond with success, and an output buffer less than
sizeof(struct smb_snapshot_array) in length. Do not leak the output
buffer in this case.

Fixes: 834170c85978 ("Enable previous version support")
Signed-off-by: David Disseldorp <dd...@suse.de>
Signed-off-by: Steve French <smfre...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/cifs/smb2ops.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -942,6 +942,7 @@ smb3_enum_snapshots(const unsigned int x
                }
                if (snapshot_in.snapshot_array_size < sizeof(struct 
smb_snapshot_array)) {
                        rc = -ERANGE;
+                       kfree(retbuf);
                        return rc;
                }