scsi: pm80xx: Fix dereferencing dangling pointer

sas_task structure should not be used after task_done is called.  If the
device is gone or not attached, we call task_done on t and continue to use
in the sas_task in rest of the function. task_done is pointing to
sas_ata_task_done, may free the memory associated with the task before
returning.

Link: https://lore.kernel.org/r/20191114100910.6153-8-deepak.ukey@microchip.com
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Vikram Auradkar <auradkar@google.com>
Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 447a66d..4491de8 100644 (file)
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -388,6 +388,7 @@ static int pm8001_task_exec(struct sas_task *task,
        struct pm8001_ccb_info *ccb;
        u32 tag = 0xdeadbeef, rc = 0, n_elem = 0;
        unsigned long flags = 0;
+       enum sas_protocol task_proto = t->task_proto;
 
        if (!dev->port) {
                struct task_status_struct *tsm = &t->task_status;
@@ -412,7 +413,7 @@ static int pm8001_task_exec(struct sas_task *task,
                pm8001_dev = dev->lldd_dev;
                port = &pm8001_ha->port[sas_find_local_port_id(dev)];
                if (DEV_IS_GONE(pm8001_dev) || !port->port_attached) {
-                       if (sas_protocol_ata(t->task_proto)) {
+                       if (sas_protocol_ata(task_proto)) {
                                struct task_status_struct *ts = &t->task_status;
                                ts->resp = SAS_TASK_UNDELIVERED;
                                ts->stat = SAS_PHY_DOWN;
@@ -434,7 +435,7 @@ static int pm8001_task_exec(struct sas_task *task,
                        goto err_out;
                ccb = &pm8001_ha->ccb_info[tag];
 
-               if (!sas_protocol_ata(t->task_proto)) {
+               if (!sas_protocol_ata(task_proto)) {
                        if (t->num_scatter) {
                                n_elem = dma_map_sg(pm8001_ha->dev,
                                        t->scatter,
@@ -454,7 +455,7 @@ static int pm8001_task_exec(struct sas_task *task,
                ccb->ccb_tag = tag;
                ccb->task = t;
                ccb->device = pm8001_dev;
-               switch (t->task_proto) {
+               switch (task_proto) {
                case SAS_PROTOCOL_SMP:
                        rc = pm8001_task_prep_smp(pm8001_ha, ccb);
                        break;
@@ -471,8 +472,7 @@ static int pm8001_task_exec(struct sas_task *task,
                        break;
                default:
                        dev_printk(KERN_ERR, pm8001_ha->dev,
-                               "unknown sas_task proto: 0x%x\n",
-                               t->task_proto);
+                               "unknown sas_task proto: 0x%x\n", task_proto);
                        rc = -EINVAL;
                        break;
                }
@@ -495,7 +495,7 @@ err_out_tag:
        pm8001_tag_free(pm8001_ha, tag);
 err_out:
        dev_printk(KERN_ERR, pm8001_ha->dev, "pm8001 exec failed[%d]!\n", rc);
-       if (!sas_protocol_ata(t->task_proto))
+       if (!sas_protocol_ata(task_proto))
                if (n_elem)
                        dma_unmap_sg(pm8001_ha->dev, t->scatter, t->num_scatter,
                                t->data_dir);