scsi: qla2xxx: Check the PCI info string output buffer size

Pass the output buffer size to the code that generates a PCI info string
and check the output buffer size while generating a PCI info string.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Himanshu Madhani <hmadhani@marvell.com>
Reviewed-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_attr.c

@@ -1125,7 +1125,8 @@ qla2x00_pci_info_show(struct device *dev, struct device_attribute *attr,
 	char pci_info[30];
 
 	return scnprintf(buf, PAGE_SIZE, "%s\n",
-	    vha->hw->isp_ops->pci_info_str(vha, pci_info));
+			 vha->hw->isp_ops->pci_info_str(vha, pci_info,
+							sizeof(pci_info)));
 }
 
 static ssize_t

drivers/scsi/qla2xxx/qla_def.h

@@ -3112,7 +3112,7 @@ struct isp_operations {
 	void (*update_fw_options) (struct scsi_qla_host *);
 	int (*load_risc) (struct scsi_qla_host *, uint32_t *);
 
-	char * (*pci_info_str) (struct scsi_qla_host *, char *);
+	char * (*pci_info_str)(struct scsi_qla_host *, char *, size_t);
 	char * (*fw_version_str)(struct scsi_qla_host *, char *, size_t);
 
 	irq_handler_t intr_handler;

drivers/scsi/qla2xxx/qla_gbl.h

@@ -732,7 +732,7 @@ extern int qlafx00_initialize_adapter(struct scsi_qla_host *);
 extern int qlafx00_soft_reset(scsi_qla_host_t *);
 extern int qlafx00_chip_diag(scsi_qla_host_t *);
 extern void qlafx00_config_rings(struct scsi_qla_host *);
-extern char *qlafx00_pci_info_str(struct scsi_qla_host *, char *);
+extern char *qlafx00_pci_info_str(struct scsi_qla_host *, char *, size_t);
 extern char *qlafx00_fw_version_str(struct scsi_qla_host *, char *, size_t);
 extern irqreturn_t qlafx00_intr_handler(int, void *);
 extern void qlafx00_enable_intrs(struct qla_hw_data *);

drivers/scsi/qla2xxx/qla_mr.c

@@ -688,14 +688,12 @@ qlafx00_config_rings(struct scsi_qla_host *vha)
 }
 
 char *
-qlafx00_pci_info_str(struct scsi_qla_host *vha, char *str)
+qlafx00_pci_info_str(struct scsi_qla_host *vha, char *str, size_t str_len)
 {
 	struct qla_hw_data *ha = vha->hw;
 
-	if (pci_is_pcie(ha->pdev)) {
-		strcpy(str, "PCIe iSA");
-		return str;
-	}
+	if (pci_is_pcie(ha->pdev))
+		strlcpy(str, "PCIe iSA", str_len);
 	return str;
 }
 

drivers/scsi/qla2xxx/qla_os.c

@@ -536,80 +536,70 @@ static void qla2x00_free_queues(struct qla_hw_data *ha)
 }
 
 static char *
-qla2x00_pci_info_str(struct scsi_qla_host *vha, char *str)
+qla2x00_pci_info_str(struct scsi_qla_host *vha, char *str, size_t str_len)
 {
 	struct qla_hw_data *ha = vha->hw;
-	static char *pci_bus_modes[] = {
+	static const char *const pci_bus_modes[] = {
 		"33", "66", "100", "133",
 	};
 	uint16_t pci_bus;
 
-	strcpy(str, "PCI");
 	pci_bus = (ha->pci_attr & (BIT_9 | BIT_10)) >> 9;
 	if (pci_bus) {
-		strcat(str, "-X (");
-		strcat(str, pci_bus_modes[pci_bus]);
+		snprintf(str, str_len, "PCI-X (%s MHz)",
+			 pci_bus_modes[pci_bus]);
 	} else {
 		pci_bus = (ha->pci_attr & BIT_8) >> 8;
-		strcat(str, " (");
-		strcat(str, pci_bus_modes[pci_bus]);
+		snprintf(str, str_len, "PCI (%s MHz)", pci_bus_modes[pci_bus]);
 	}
-	strcat(str, " MHz)");
 
-	return (str);
+	return str;
 }
 
 static char *
-qla24xx_pci_info_str(struct scsi_qla_host *vha, char *str)
+qla24xx_pci_info_str(struct scsi_qla_host *vha, char *str, size_t str_len)
 {
-	static char *pci_bus_modes[] = { "33", "66", "100", "133", };
+	static const char *const pci_bus_modes[] = {
+		"33", "66", "100", "133",
+	};
 	struct qla_hw_data *ha = vha->hw;
 	uint32_t pci_bus;
 
 	if (pci_is_pcie(ha->pdev)) {
-		char lwstr[6];
 		uint32_t lstat, lspeed, lwidth;
+		const char *speed_str;
 
 		pcie_capability_read_dword(ha->pdev, PCI_EXP_LNKCAP, &lstat);
 		lspeed = lstat & PCI_EXP_LNKCAP_SLS;
 		lwidth = (lstat & PCI_EXP_LNKCAP_MLW) >> 4;
 
-		strcpy(str, "PCIe (");
 		switch (lspeed) {
 		case 1:
-			strcat(str, "2.5GT/s ");
+			speed_str = "2.5GT/s";
 			break;
 		case 2:
-			strcat(str, "5.0GT/s ");
+			speed_str = "5.0GT/s";
 			break;
 		case 3:
-			strcat(str, "8.0GT/s ");
+			speed_str = "8.0GT/s";
 			break;
 		default:
-			strcat(str, "<unknown> ");
+			speed_str = "<unknown>";
 			break;
 		}
-		snprintf(lwstr, sizeof(lwstr), "x%d)", lwidth);
-		strcat(str, lwstr);
+		snprintf(str, str_len, "PCIe (%s x%d)", speed_str, lwidth);
 
 		return str;
 	}
 
-	strcpy(str, "PCI");
 	pci_bus = (ha->pci_attr & CSRX_PCIX_BUS_MODE_MASK) >> 8;
-	if (pci_bus == 0 || pci_bus == 8) {
-		strcat(str, " (");
-		strcat(str, pci_bus_modes[pci_bus >> 3]);
-	} else {
-		strcat(str, "-X ");
-		if (pci_bus & BIT_2)
-			strcat(str, "Mode 2");
-		else
-			strcat(str, "Mode 1");
-		strcat(str, " (");
-		strcat(str, pci_bus_modes[pci_bus & ~BIT_2]);
-	}
-	strcat(str, " MHz)");
+	if (pci_bus == 0 || pci_bus == 8)
+		snprintf(str, str_len, "PCI (%s MHz)",
+			 pci_bus_modes[pci_bus >> 3]);
+	else
+		snprintf(str, str_len, "PCI-X Mode %d (%s MHz)",
+			 pci_bus & 4 ? 2 : 1,
+			 pci_bus_modes[pci_bus & 3]);
 
 	return str;
 }
@@ -3460,7 +3450,8 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	    "QLogic %s - %s.\n", ha->model_number, ha->model_desc);
 	ql_log(ql_log_info, base_vha, 0x00fc,
 	    "ISP%04X: %s @ %s hdma%c host#=%ld fw=%s.\n",
-	    pdev->device, ha->isp_ops->pci_info_str(base_vha, pci_info),
+	    pdev->device, ha->isp_ops->pci_info_str(base_vha, pci_info,
+						       sizeof(pci_info)),
 	    pci_name(pdev), ha->flags.enable_64bit_addressing ? '+' : '-',
 	    base_vha->host_no,
 	    ha->isp_ops->fw_version_str(base_vha, fw_str, sizeof(fw_str)));