scsi: lpfc: Fix panic when FW-log buffsize is not initialized

While trying to get adapter fw-log for a function whose buffsize was set to
0, kernel panic occurred.

When buffsize is 0, the kernel buffer for the log won't be allocated.  When
fw log usage was enabled, it failed to check the buffer size, and log usage
was started. Eventually the driver referenced the unallocated log buffer.

Added checks of the buffer size before allowing fw logging to be enabled
and added check for valid buffer if enabling fw log.

Performed a couple other minor cleanups while fixing this:
 - clarified log messages
 - re-evaluated log message severity
 - treat any error as an error, not only a couple codes

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c
index 43dcd1daa616..9b8edfb06cb0 100644
--- a/drivers/scsi/lpfc/lpfc_bsg.c
+++ b/drivers/scsi/lpfc/lpfc_bsg.c
@@ -5348,7 +5348,7 @@ lpfc_bsg_get_ras_config(struct bsg_job *job)
 	    sizeof(struct fc_bsg_request) +
 	    sizeof(struct lpfc_bsg_ras_req)) {
 		lpfc_printf_log(phba, KERN_ERR, LOG_LIBDFC,
-				"6181 Received RAS_LOG request "
+				"6192 FW_LOG request received "
 				"below minimum size\n");
 		rc = -EINVAL;
 		goto ras_job_error;
@@ -5356,7 +5356,7 @@ lpfc_bsg_get_ras_config(struct bsg_job *job)
 
 	/* Check FW log status */
 	rc = lpfc_check_fwlog_support(phba);
-	if (rc == -EACCES || rc == -EPERM)
+	if (rc)
 		goto ras_job_error;
 
 	ras_reply = (struct lpfc_bsg_get_ras_config_reply *)
@@ -5430,7 +5430,7 @@ lpfc_bsg_set_ras_config(struct bsg_job *job)
 
 	/* Check FW log status */
 	rc = lpfc_check_fwlog_support(phba);
-	if (rc == -EACCES || rc == -EPERM)
+	if (rc)
 		goto ras_job_error;
 
 	ras_req = (struct lpfc_bsg_set_ras_config_req *)
@@ -5500,7 +5500,7 @@ lpfc_bsg_get_ras_lwpd(struct bsg_job *job)
 	int rc = 0;
 
 	rc = lpfc_check_fwlog_support(phba);
-	if (rc == -EACCES || rc == -EPERM)
+	if (rc)
 		goto ras_job_error;
 
 	if (job->request_len <
@@ -5516,6 +5516,12 @@ lpfc_bsg_get_ras_lwpd(struct bsg_job *job)
 	ras_reply = (struct lpfc_bsg_get_ras_lwpd *)
 		bsg_reply->reply_data.vendor_reply.vendor_rsp;
 
+	if (!ras_fwlog->lwpd.virt) {
+		lpfc_printf_log(phba, KERN_ERR, LOG_LIBDFC,
+				"6193 Restart FW Logging\n");
+		return -EINVAL;
+	}
+
 	/* Get lwpd offset */
 	lwpd_ptr = (uint32_t *)(ras_fwlog->lwpd.virt);
 	ras_reply->offset = be32_to_cpu(*lwpd_ptr & 0xffffffff);
@@ -5557,7 +5563,7 @@ lpfc_bsg_get_ras_fwlog(struct bsg_job *job)
 	ras_fwlog = &phba->ras_fwlog;
 
 	rc = lpfc_check_fwlog_support(phba);
-	if (rc == -EACCES || rc == -EPERM)
+	if (rc)
 		goto ras_job_error;
 
 	/* Logging to be stopped before reading */