From: Adrian Hunter adrian.hunter@intel.com
commit 886fe2915cce6658b0fc19e64b82879325de61ea upstream.
__ufshcd_issue_tm_cmd() clears req->end_io_data after timing out, which races with the completion function ufshcd_tmc_handler() which expects req->end_io_data to have a value.
Note __ufshcd_issue_tm_cmd() and ufshcd_tmc_handler() are already synchronized using hba->tmf_rqs and hba->outstanding_tasks under the host_lock spinlock.
It is also not necessary (nor typical) to clear req->end_io_data because the block layer does it before allocating out requests e.g. via blk_get_request().
So fix by not clearing it.
Link: https://lore.kernel.org/r/20211108064815.569494-2-adrian.hunter@intel.com Fixes: f5ef336fd2e4 ("scsi: ufs: core: Fix task management completion") Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com [Adrian: Backport to v5.10] Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/ufs/ufshcd.c | 5 ----- 1 file changed, 5 deletions(-)
--- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6280,11 +6280,6 @@ static int __ufshcd_issue_tm_cmd(struct err = wait_for_completion_io_timeout(&wait, msecs_to_jiffies(TM_CMD_TIMEOUT)); if (!err) { - /* - * Make sure that ufshcd_compl_tm() does not trigger a - * use-after-free. - */ - req->end_io_data = NULL; ufshcd_add_tm_upiu_trace(hba, task_tag, "tm_complete_err"); dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n", __func__, tm_function);