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authorVikram Auradkar <auradkar@google.com>2019-11-14 15:39:04 +0530
committerMartin K. Petersen <martin.petersen@oracle.com>2019-11-19 21:37:33 -0500
commita88d9db94c4c9fb2b6ce9f5748928bef46aa9885 (patch)
tree756c71b5a5c51f2afcc1820d31e1162ccb9f3b72 /drivers/scsi/pm8001/pm8001_sas.c
parente90e236250e9edd2584a3405d0b2482ef687a637 (diff)
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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>
Diffstat (limited to 'drivers/scsi/pm8001/pm8001_sas.c')
-rw-r--r--drivers/scsi/pm8001/pm8001_sas.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 447a66d60275..4491de8d40fc 100644
--- 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);