cifs: fix leak in FSCTL_ENUM_SNAPS response handling
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: 834170c8 ("Enable previous version support") Signed-off-by: David Disseldorp <ddiss@suse.de> CC: Stable <stable@vger.kernel.org> Signed-off-by: Steve French <smfrench@gmail.com>
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