[PATCH] cifs: fix memory leak of pneg_inbuf on -EOPNOTSUPP ioctl case

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

Currently in the case where SMB2_ioctl returns the -EOPNOTSUPP error
there is a memory leak of pneg_inbuf. Fix this by returning via
the out_free_inbuf exit path that will perform the relevant kfree.

Addresses-Coverity: ("Resource leak")
Fixes: 969ae8e8d4ee ("cifs: Accept validate negotiate if server return 
NT_STATUS_NOT_SUPPORTED")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 fs/cifs/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 710ceb875161..5b8d1482ffbd 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1054,7 +1054,8 @@ int smb3_validate_negotiate(const unsigned int xid, 
struct cifs_tcon *tcon)
                 * not supported error. Client should accept it.
                 */
                cifs_dbg(VFS, "Server does not support validate negotiate\n");
-               return 0;
+               rc = 0;
+               goto out_free_inbuf;
        } else if (rc != 0) {
                cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
                rc = -EIO;
-- 
2.20.1