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    Subject[ 049/108] tcm_fc: Fix fc_exch memory leak in ft_send_resp_status
    3.0-stable review patch.  If anyone has any objections, please let me know.


    From: Nicholas Bellinger <>

    commit 031ed4d565b31880a4136bb7366bc89f5b1dba7d upstream.

    This patch fixes a bug in tcm_fc where fc_exch memory from fc_exch_mgr->ep_pool
    is currently being leaked by ft_send_resp_status() usage. Following current
    code in ft_queue_status() response path, using lport->tt.seq_send() needs to be
    followed by a lport->tt.exch_done() in order to release fc_exch memory back into
    libfc_em kmem_cache.

    ft_send_resp_status() code is currently used in pre submit se_cmd ft_send_work()
    error exceptions, TM request setup exceptions, and main TM response callback
    path in ft_queue_tm_resp(). This bugfix addresses the leak in these cases.

    Cc: Mark D Rustad <>
    Cc: Kiran Patil <>
    Cc: Robert Love <>
    Cc: Andy Grover <>
    Signed-off-by: Nicholas Bellinger <>
    Signed-off-by: Greg Kroah-Hartman <>

    drivers/target/tcm_fc/tfc_cmd.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    --- a/drivers/target/tcm_fc/tfc_cmd.c
    +++ b/drivers/target/tcm_fc/tfc_cmd.c
    @@ -371,10 +371,12 @@ static void ft_send_resp_status(struct f

    fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
    sp = fr_seq(fp);
    - if (sp)
    + if (sp) {
    lport->tt.seq_send(lport, sp, fp);
    - else
    + lport->tt.exch_done(sp);
    + } else {
    lport->tt.frame_send(lport, fp);
    + }


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