[SCSI] qla2xxx: Correct use-after-free oops seen during EH-abort.

Hold a reference to the srb (sp) while aborting an I/O -- as the
I/O can/will complete from within the interrupt-context.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 31 insertions, 1 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 83961090901..f8239bff092 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -202,6 +202,7 @@ struct sd_dif_tuple {
  * SCSI Request Block
  */
 typedef struct srb {
+        atomic_t ref_count;
         struct fc_port *fcport;
         uint32_t handle;
 
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index c345ba71672..9e656296b75 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -517,6 +517,7 @@ qla2x00_get_new_sp(scsi_qla_host_t *vha, fc_port_t *fcport,
         if (!sp)
                 return sp;
 
+        atomic_set(&sp->ref_count, 1);
         sp->fcport = fcport;
         sp->cmd = cmd;
         sp->flags = 0;
@@ -797,6 +798,12 @@ qla2x00_wait_for_loop_ready(scsi_qla_host_t *vha)
         return (return_status);
 }
 
+static void
+sp_get(struct srb *sp)
+{
+        atomic_inc(&sp->ref_count);
+}
+
 /**************************************************************************
 * qla2xxx_eh_abort
 *
@@ -825,6 +832,7 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd)
         struct qla_hw_data *ha = vha->hw;
         struct req_que *req = vha->req;
         srb_t *spt;
+        int got_ref = 0;
 
         fc_block_scsi_eh(cmd);
 
@@ -856,6 +864,10 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd)
                 DEBUG2(printk("%s(%ld): aborting sp %p from RISC."
                 " pid=%ld.\n", __func__, vha->host_no, sp, serial));
 
+                /* Get a reference to the sp and drop the lock.*/
+                sp_get(sp);
+                got_ref++;
+
                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
                 if (ha->isp_ops->abort_command(sp)) {
                         DEBUG2(printk("%s(%ld): abort_command "
@@ -881,6 +893,9 @@ qla2xxx_eh_abort(struct scsi_cmnd *cmd)
                 }
         }
 
+        if (got_ref)
+                qla2x00_sp_compl(ha, sp);
+
         qla_printk(KERN_INFO, ha,
             "scsi(%ld:%d:%d): Abort command issued -- %d %lx %x.\n",
             vha->host_no, id, lun, wait, serial, ret);
@@ -3468,7 +3483,7 @@ qla2x00_sp_free_dma(srb_t *sp)
 }
 
 void
-qla2x00_sp_compl(struct qla_hw_data *ha, srb_t *sp)
+qla2x00_sp_final_compl(struct qla_hw_data *ha, srb_t *sp)
 {
         struct scsi_cmnd *cmd = sp->cmd;
 
@@ -3489,6 +3504,20 @@ qla2x00_sp_compl(struct qla_hw_data *ha, srb_t *sp)
         cmd->scsi_done(cmd);
 }
 
+void
+qla2x00_sp_compl(struct qla_hw_data *ha, srb_t *sp)
+{
+        if (atomic_read(&sp->ref_count) == 0) {
+                DEBUG2(qla_printk(KERN_WARNING, ha,
+                    "SP reference-count to ZERO -- sp=%p\n", sp));
+                DEBUG2(BUG());
+                return;
+        }
+        if (!atomic_dec_and_test(&sp->ref_count))
+                return;
+        qla2x00_sp_final_compl(ha, sp);
+}
+
 /**************************************************************************
 *   qla2x00_timer
 *