From: Can Guo cang@codeaurora.org

mainline inclusion from mainline-v5.11-rc4 commit 35fc4cd34426c242ab015ef280853b7bff101f48 category: bugfix bugzilla: NA CVE: CVE-2021-39657

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Users can initiate resets to specific SCSI device/target/host through IOCTL. When this happens, the SCSI cmd passed to eh_device/target/host _reset_handler() callbacks is initialized with a request whose tag is -1. In this case it is not right for eh_device_reset_handler() callback to count on the LUN get from hba->lrb[-1]. Fix it by getting LUN from the SCSI device associated with the SCSI cmd.

Link: https://lore.kernel.org/r/1609157080-26283-1-git-send-email-cang@codeaurora.... Reviewed-by: Avri Altman avri.altman@wdc.com Reviewed-by: Stanley Chu stanley.chu@mediatek.com Signed-off-by: Can Guo cang@codeaurora.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Ye Bin yebin10@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Reviewed-by: Jason Yan yanaijie@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/scsi/ufs/ufshcd.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 3601e770da162..3d9bfa5207689 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5752,19 +5752,16 @@ static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd) { struct Scsi_Host *host; struct ufs_hba *hba; - unsigned int tag; u32 pos; int err; - u8 resp = 0xF; - struct ufshcd_lrb *lrbp; + u8 resp = 0xF, lun; unsigned long flags;

host = cmd->device->host; hba = shost_priv(host); - tag = cmd->request->tag;

- lrbp = &hba->lrb[tag]; - err = ufshcd_issue_tm_cmd(hba, lrbp->lun, 0, UFS_LOGICAL_RESET, &resp); + lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun); + err = ufshcd_issue_tm_cmd(hba, lun, 0, UFS_LOGICAL_RESET, &resp); if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) { if (!err) err = resp; @@ -5773,7 +5770,7 @@ static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)

/* clear the commands that were pending for corresponding LUN */ for_each_set_bit(pos, &hba->outstanding_reqs, hba->nutrs) { - if (hba->lrb[pos].lun == lrbp->lun) { + if (hba->lrb[pos].lun == lun) { err = ufshcd_clear_cmd(hba, pos); if (err) break;