[PATCH 3.2 27/61] scsi: aacraid: Fix command send race condition

[Ben Hutchings <ben@decadent.org.uk>]

3.2.96-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Brian King <brking@linux.vnet.ibm.com>

commit 1ae948fa4f00f3a2823e7cb19a3049ef27dd6947 upstream.

This fixes a potential race condition observed on Power systems.

Several places throughout the aacraid driver call aac_fib_send or
similar to send a command to the aacraid adapter, then check the return
code to determine if the command was actually sent to the adapter, then
update the phase field in the scsi command scratch pad area to track
that the firmware now owns this command.  However, there is nothing that
ensures that by the time the aac_fib_send function returns and we go to
write to the scsi command, that the command hasn't already completed and
the scsi command has been freed.  This was causing random crashes in the
TCP stack which was tracked down to be caused by memory that had been a
struct request + scsi_cmnd being now used for an skbuff. Memory
poisoning was enabled in the kernel to debug this which showed that the
last owner of the memory that had been freed was aacraid and that it was
a struct request.  The memory that was corrupted was the exact data
pattern of AAC_OWNER_FIRMWARE and it was at the same offset that aacraid
writes, which is scsicmd->SCp.phase. The patch below resolves this
issue.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Tested-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: Dave Carroll <david.carroll@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
[bwh: Backported to 3.2:
 - Drop changes to aac_send_hba_fib()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -468,6 +468,7 @@ static int aac_get_container_name(struct
 
 	aac_fib_init(cmd_fibcontext);
 	dinfo = (struct aac_get_name *) fib_data(cmd_fibcontext);
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 
 	dinfo->command = cpu_to_le32(VM_ContainerConfig);
 	dinfo->type = cpu_to_le32(CT_READ_NAME);
@@ -485,10 +486,8 @@ static int aac_get_container_name(struct
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	printk(KERN_WARNING "aac_get_container_name: aac_fib_send failed with status: %d.\n", status);
 	aac_fib_complete(cmd_fibcontext);
@@ -577,6 +576,7 @@ static void _aac_probe_container1(void *
 	dinfo->command = cpu_to_le32(VM_NameServe64);
 	dinfo->count = cpu_to_le32(scmd_id(scsicmd));
 	dinfo->type = cpu_to_le32(FT_FILESYS);
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 
 	status = aac_fib_send(ContainerCommand,
 			  fibptr,
@@ -588,9 +588,7 @@ static void _aac_probe_container1(void *
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS)
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
-	else if (status < 0) {
+	if (status < 0 && status != -EINPROGRESS) {
 		/* Inherit results from VM_NameServe, if any */
 		dresp->status = cpu_to_le32(ST_OK);
 		_aac_probe_container2(context, fibptr);
@@ -613,6 +611,7 @@ static int _aac_probe_container(struct s
 		dinfo->count = cpu_to_le32(scmd_id(scsicmd));
 		dinfo->type = cpu_to_le32(FT_FILESYS);
 		scsicmd->SCp.ptr = (char *)callback;
+		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 
 		status = aac_fib_send(ContainerCommand,
 			  fibptr,
@@ -624,10 +623,9 @@ static int _aac_probe_container(struct s
 		/*
 		 *	Check that the command queued to the controller
 		 */
-		if (status == -EINPROGRESS) {
-			scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+		if (status == -EINPROGRESS)
 			return 0;
-		}
+
 		if (status < 0) {
 			scsicmd->SCp.ptr = NULL;
 			aac_fib_complete(fibptr);
@@ -861,6 +859,7 @@ static int aac_get_container_serial(stru
 	dinfo->command = cpu_to_le32(VM_ContainerConfig);
 	dinfo->type = cpu_to_le32(CT_CID_TO_32BITS_UID);
 	dinfo->cid = cpu_to_le32(scmd_id(scsicmd));
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 
 	status = aac_fib_send(ContainerCommand,
 		  cmd_fibcontext,
@@ -873,10 +872,8 @@ static int aac_get_container_serial(stru
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	printk(KERN_WARNING "aac_get_container_serial: aac_fib_send failed with status: %d.\n", status);
 	aac_fib_complete(cmd_fibcontext);
@@ -1689,16 +1686,14 @@ static int aac_read(struct scsi_cmnd * s
 		printk(KERN_WARNING "aac_read: fib allocation failed\n");
 		return -1;
 	}
-
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 	status = aac_adapter_read(cmd_fibcontext, scsicmd, lba, count);
 
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	printk(KERN_WARNING "aac_read: aac_fib_send failed with status: %d.\n", status);
 	/*
@@ -1792,16 +1787,14 @@ static int aac_write(struct scsi_cmnd *
 		printk(KERN_WARNING "aac_write: fib allocation failed\n");
 		return -1;
 	}
-
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 	status = aac_adapter_write(cmd_fibcontext, scsicmd, lba, count, fua);
 
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	printk(KERN_WARNING "aac_write: aac_fib_send failed with status: %d\n", status);
 	/*
@@ -1951,6 +1944,7 @@ static int aac_synchronize(struct scsi_c
 	synchronizecmd->cid = cpu_to_le32(scmd_id(scsicmd));
 	synchronizecmd->count =
 	     cpu_to_le32(sizeof(((struct aac_synchronize_reply *)NULL)->data));
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 
 	/*
 	 *	Now send the Fib to the adapter
@@ -1966,10 +1960,8 @@ static int aac_synchronize(struct scsi_c
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	printk(KERN_WARNING
 		"aac_synchronize: aac_fib_send failed with status: %d.\n", status);
@@ -2031,6 +2023,7 @@ static int aac_start_stop(struct scsi_cm
 	pmcmd->cid = cpu_to_le32(sdev_id(sdev));
 	pmcmd->parm = (scsicmd->cmnd[1] & 1) ?
 		cpu_to_le32(CT_PM_UNIT_IMMEDIATE) : 0;
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 
 	/*
 	 *	Now send the Fib to the adapter
@@ -2046,10 +2039,8 @@ static int aac_start_stop(struct scsi_cm
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	aac_fib_complete(cmd_fibcontext);
 	aac_fib_free(cmd_fibcontext);
@@ -2798,15 +2789,14 @@ static int aac_send_srb_fib(struct scsi_
 	if (!(cmd_fibcontext = aac_fib_alloc(dev))) {
 		return -1;
 	}
+	scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
 	status = aac_adapter_scsi(cmd_fibcontext, scsicmd);
 
 	/*
 	 *	Check that the command queued to the controller
 	 */
-	if (status == -EINPROGRESS) {
-		scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+	if (status == -EINPROGRESS)
 		return 0;
-	}
 
 	printk(KERN_WARNING "aac_srb: aac_fib_send failed with status: %d\n", status);
 	aac_fib_complete(cmd_fibcontext);