scsi: ufs: verify command tag validity

A race condition appear to exist between request completion when
scsi_done() is called to end the request and set the tag back to -1 (at
blk_queue_end_tag() scsi_end_request), and scsi layer error handling
which aborts the command and reuses it to request sense data. Sending
the request sense is done with tag which was set to -1 and so it is
invalid.  Assert command tag passed from scsi layer is valid.

Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 7ae87c9..8a34f61 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -190,6 +190,10 @@ static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
                struct ufs_pa_layer_attr *desired_pwr_mode);
 static int ufshcd_change_power_mode(struct ufs_hba *hba,
                             struct ufs_pa_layer_attr *pwr_mode);
+static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag)
+{
+       return tag >= 0 && tag < hba->nutrs;
+}
 
 static inline int ufshcd_enable_irq(struct ufs_hba *hba)
 {
@@ -1309,6 +1313,12 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
        hba = shost_priv(host);
 
        tag = cmd->request->tag;
+       if (!ufshcd_valid_tag(hba, tag)) {
+               dev_err(hba->dev,
+                       "%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p",
+                       __func__, tag, cmd, cmd->request);
+               BUG();
+       }
 
        spin_lock_irqsave(hba->host->host_lock, flags);
        switch (hba->ufshcd_state) {
@@ -3861,13 +3871,23 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
        host = cmd->device->host;
        hba = shost_priv(host);
        tag = cmd->request->tag;
+       if (!ufshcd_valid_tag(hba, tag)) {
+               dev_err(hba->dev,
+                       "%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p",
+                       __func__, tag, cmd, cmd->request);
+               BUG();
+       }
 
        ufshcd_hold(hba, false);
+       reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
        /* If command is already aborted/completed, return SUCCESS */
-       if (!(test_bit(tag, &hba->outstanding_reqs)))
+       if (!(test_bit(tag, &hba->outstanding_reqs))) {
+               dev_err(hba->dev,
+                       "%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
+                       __func__, tag, hba->outstanding_reqs, reg);
                goto out;
+       }
 
-       reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
        if (!(reg & (1 << tag))) {
                dev_err(hba->dev,
                "%s: cmd was completed, but without a notifying intr, tag = %d",