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    Subject[PATCH 4.9 039/310] SMB2: Fix share type handling
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

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

    From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>


    [ Upstream commit cd1230070ae1c12fd34cf6a557bfa81bf9311009 ]

    In fs/cifs/smb2pdu.h, we have:
    #define SMB2_SHARE_TYPE_DISK 0x01
    #define SMB2_SHARE_TYPE_PIPE 0x02
    #define SMB2_SHARE_TYPE_PRINT 0x03

    Knowing that, with the current code, the SMB2_SHARE_TYPE_PRINT case can
    never trigger and printer share would be interpreted as disk share.

    So, test the ShareType value for equality instead.

    Fixes: faaf946a7d5b ("CIFS: Add tree connect/disconnect capability for SMB2")
    Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
    Acked-by: Aurelien Aptel <aaptel@suse.com>
    Signed-off-by: Steve French <smfrench@gmail.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/cifs/smb2pdu.c | 14 +++++++++-----
    1 file changed, 9 insertions(+), 5 deletions(-)

    --- a/fs/cifs/smb2pdu.c
    +++ b/fs/cifs/smb2pdu.c
    @@ -1151,15 +1151,19 @@ SMB2_tcon(const unsigned int xid, struct
    goto tcon_exit;
    }

    - if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
    + switch (rsp->ShareType) {
    + case SMB2_SHARE_TYPE_DISK:
    cifs_dbg(FYI, "connection to disk share\n");
    - else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
    + break;
    + case SMB2_SHARE_TYPE_PIPE:
    tcon->ipc = true;
    cifs_dbg(FYI, "connection to pipe share\n");
    - } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
    - tcon->print = true;
    + break;
    + case SMB2_SHARE_TYPE_PRINT:
    + tcon->ipc = true;
    cifs_dbg(FYI, "connection to printer\n");
    - } else {
    + break;
    + default:
    cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
    rc = -EOPNOTSUPP;
    goto tcon_error_exit;

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