iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task

Browse Source 
Currently a use-after-free may occur if a sas_task is aborted by the upper
layer before we handle the I/O completion in mpi_ssp_completion() or
mpi_sata_completion().

In this case, the following are the two steps in handling those I/O
completions:

 - Call complete() to inform the upper layer handler of completion of
   the I/O.

 - Release driver resources associated with the sas_task in
   pm8001_ccb_task_free() call.

When complete() is called, the upper layer may free the sas_task. As such,
we should not touch the associated sas_task afterwards, but we do so in the
pm8001_ccb_task_free() call.

Fix by swapping the complete() and pm8001_ccb_task_free() calls ordering.

Link: https://lore.kernel.org/r/1643289172-165636-4-git-send-email-john.garry@huawei.com
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2022-01-27 21:12:52 +08:00 committed by Martin K. Petersen
parent 61f162aa43
commit df7abcaa12
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/scsi/pm8001/pm80xx_hwi.c
View File

@ -2185,9 +2185,9 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
pm8001_dbg(pm8001_ha, FAIL,
"task 0x%p done with io_status 0x%x resp 0x%x stat 0x%x but aborted by upper layer!\n",
t, status, ts->resp, ts->stat);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
if (t->slow_task)
complete(&t->slow_task->completion);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
} else {
spin_unlock_irqrestore(&t->task_state_lock, flags);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
@ -2794,9 +2794,9 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha,
pm8001_dbg(pm8001_ha, FAIL,
"task 0x%p done with io_status 0x%x resp 0x%x stat 0x%x but aborted by upper layer!\n",
t, status, ts->resp, ts->stat);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
if (t->slow_task)
complete(&t->slow_task->completion);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
} else {
spin_unlock_irqrestore(&t->task_state_lock, flags);
spin_unlock_irqrestore(&circularQ->oq_lock,