From f84d461f33a6b27304d468d9cfb56c0cefdb4ee7 Mon Sep 17 00:00:00 2001 From: Peter Wang Date: Mon, 6 Nov 2023 15:51:17 +0800 Subject: [PATCH] scsi: ufs: core: Fix racing issue between ufshcd_mcq_abort() and ISR commit 27900d7119c464b43cd9eac69c85884d17bae240 upstream. If command timeout happens and cq complete IRQ is raised at the same time, ufshcd_mcq_abort clears lprb->cmd and a NULL pointer deref happens in the ISR. Error log: ufshcd_abort: Device abort task at tag 18 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000108 pc : [0xffffffe27ef867ac] scsi_dma_unmap+0xc/0x44 lr : [0xffffffe27f1b898c] ufshcd_release_scsi_cmd+0x24/0x114 Fixes: f1304d442077 ("scsi: ufs: mcq: Added ufshcd_mcq_abort()") Cc: stable@vger.kernel.org Signed-off-by: Peter Wang Link: https://lore.kernel.org/r/20231106075117.8995-1-peter.wang@mediatek.com Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/ufs/core/ufs-mcq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 5c75ab9..0787456 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -630,6 +630,7 @@ int ufshcd_mcq_abort(struct scsi_cmnd *cmd) int tag = scsi_cmd_to_rq(cmd)->tag; struct ufshcd_lrb *lrbp = &hba->lrb[tag]; struct ufs_hw_queue *hwq; + unsigned long flags; int err = FAILED; if (!ufshcd_cmd_inflight(lrbp->cmd)) { @@ -670,8 +671,10 @@ int ufshcd_mcq_abort(struct scsi_cmnd *cmd) } err = SUCCESS; + spin_lock_irqsave(&hwq->cq_lock, flags); if (ufshcd_cmd_inflight(lrbp->cmd)) ufshcd_release_scsi_cmd(hba, lrbp); + spin_unlock_irqrestore(&hwq->cq_lock, flags); out: return err; -- 2.7.4