[SCSI] ipr: fix resource path display and formatting

It was possible to overflow the buffer used to print out the formatted
version of the resource path.  The fix is to limit the number of
bytes that get formatted.

This patch also updates the ipr_show_resource_path function to display the
resource address for devices that are attached to adapters that don't
support resource paths.

Signed-off-by: Wayne Boyer <wayneb@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 33 insertions, 18 deletions

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 82ea4a8226b0..f820cffb7f00 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -1129,20 +1129,22 @@ static int ipr_is_same_device(struct ipr_resource_entry *res,
 }
 
 /**
- * ipr_format_resource_path - Format the resource path for printing.
+ * ipr_format_res_path - Format the resource path for printing.
  * @res_path:   resource path
  * @buf:        buffer
  *
  * Return value:
  *      pointer to buffer
  **/
-static char *ipr_format_resource_path(u8 *res_path, char *buffer)
+static char *ipr_format_res_path(u8 *res_path, char *buffer, int len)
 {
         int i;
+        char *p = buffer;
 
-        sprintf(buffer, "%02X", res_path[0]);
-        for (i=1; res_path[i] != 0xff; i++)
-                sprintf(buffer, "%s-%02X", buffer, res_path[i]);
+        res_path[0] = '\0';
+        p += snprintf(p, buffer + len - p, "%02X", res_path[0]);
+        for (i = 1; res_path[i] != 0xff && ((i * 3) < len); i++)
+                p += snprintf(p, buffer + len - p, "-%02X", res_path[i]);
 
         return buffer;
 }
@@ -1187,7 +1189,8 @@ static void ipr_update_res_entry(struct ipr_resource_entry *res,
 
                 if (res->sdev && new_path)
                         sdev_printk(KERN_INFO, res->sdev, "Resource path: %s\n",
-                                    ipr_format_resource_path(&res->res_path[0], &buffer[0]));
+                                    ipr_format_res_path(res->res_path, buffer,
+                                                        sizeof(buffer)));
         } else {
                 res->flags = cfgtew->u.cfgte->flags;
                 if (res->flags & IPR_IS_IOA_RESOURCE)
@@ -1573,7 +1576,8 @@ static void ipr_log_sis64_config_error(struct ipr_ioa_cfg *ioa_cfg,
                 ipr_err_separator;
 
                 ipr_err("Device %d : %s", i + 1,
-                         ipr_format_resource_path(&dev_entry->res_path[0], &buffer[0]));
+                         ipr_format_res_path(dev_entry->res_path, buffer,
+                                             sizeof(buffer)));
                 ipr_log_ext_vpd(&dev_entry->vpd);
 
                 ipr_err("-----New Device Information-----\n");
@@ -1919,13 +1923,14 @@ static void ipr_log64_fabric_path(struct ipr_hostrcb *hostrcb,
 
                         ipr_hcam_err(hostrcb, "%s %s: Resource Path=%s\n",
                                      path_active_desc[i].desc, path_state_desc[j].desc,
-                                     ipr_format_resource_path(&fabric->res_path[0], &buffer[0]));
+                                     ipr_format_res_path(fabric->res_path, buffer,
+                                                         sizeof(buffer)));
                         return;
                 }
         }
 
         ipr_err("Path state=%02X Resource Path=%s\n", path_state,
-                ipr_format_resource_path(&fabric->res_path[0], &buffer[0]));
+                ipr_format_res_path(fabric->res_path, buffer, sizeof(buffer)));
 }
 
 static const struct {
@@ -2066,7 +2071,8 @@ static void ipr_log64_path_elem(struct ipr_hostrcb *hostrcb,
 
                         ipr_hcam_err(hostrcb, "%s %s: Resource Path=%s, Link rate=%s, WWN=%08X%08X\n",
                                      path_status_desc[j].desc, path_type_desc[i].desc,
-                                     ipr_format_resource_path(&cfg->res_path[0], &buffer[0]),
+                                     ipr_format_res_path(cfg->res_path, buffer,
+                                                         sizeof(buffer)),
                                      link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                                      be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
                         return;
@@ -2074,7 +2080,7 @@ static void ipr_log64_path_elem(struct ipr_hostrcb *hostrcb,
         }
         ipr_hcam_err(hostrcb, "Path element=%02X: Resource Path=%s, Link rate=%s "
                      "WWN=%08X%08X\n", cfg->type_status,
-                     ipr_format_resource_path(&cfg->res_path[0], &buffer[0]),
+                     ipr_format_res_path(cfg->res_path, buffer, sizeof(buffer)),
                      link_rate[cfg->link_rate & IPR_PHY_LINK_RATE_MASK],
                      be32_to_cpu(cfg->wwid[0]), be32_to_cpu(cfg->wwid[1]));
 }
@@ -2139,7 +2145,7 @@ static void ipr_log_sis64_array_error(struct ipr_ioa_cfg *ioa_cfg,
 
         ipr_err("RAID %s Array Configuration: %s\n",
                 error->protection_level,
-                ipr_format_resource_path(&error->last_res_path[0], &buffer[0]));
+                ipr_format_res_path(error->last_res_path, buffer, sizeof(buffer)));
 
         ipr_err_separator;
 
@@ -2160,9 +2166,11 @@ static void ipr_log_sis64_array_error(struct ipr_ioa_cfg *ioa_cfg,
                 ipr_err("Array Member %d:\n", i);
                 ipr_log_ext_vpd(&array_entry->vpd);
                 ipr_err("Current Location: %s",
-                         ipr_format_resource_path(&array_entry->res_path[0], &buffer[0]));
+                         ipr_format_res_path(array_entry->res_path, buffer,
+                                             sizeof(buffer)));
                 ipr_err("Expected Location: %s",
-                         ipr_format_resource_path(&array_entry->expected_res_path[0], &buffer[0]));
+                         ipr_format_res_path(array_entry->expected_res_path,
+                                             buffer, sizeof(buffer)));
 
                 ipr_err_separator;
         }
@@ -4079,7 +4087,8 @@ static struct device_attribute ipr_adapter_handle_attr = {
 };
 
 /**
- * ipr_show_resource_path - Show the resource path for this device.
+ * ipr_show_resource_path - Show the resource path or the resource address for
+ *                          this device.
  * @dev:        device struct
  * @buf:        buffer
  *
@@ -4097,9 +4106,14 @@ static ssize_t ipr_show_resource_path(struct device *dev, struct device_attribut
 
         spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
         res = (struct ipr_resource_entry *)sdev->hostdata;
-        if (res)
+        if (res && ioa_cfg->sis64)
                 len = snprintf(buf, PAGE_SIZE, "%s\n",
-                               ipr_format_resource_path(&res->res_path[0], &buffer[0]));
+                               ipr_format_res_path(res->res_path, buffer,
+                                                   sizeof(buffer)));
+        else if (res)
+                len = snprintf(buf, PAGE_SIZE, "%d:%d:%d:%d\n", ioa_cfg->host->host_no,
+                               res->bus, res->target, res->lun);
+
         spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
         return len;
 }
@@ -4351,7 +4365,8 @@ static int ipr_slave_configure(struct scsi_device *sdev)
                         scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
                 if (ioa_cfg->sis64)
                         sdev_printk(KERN_INFO, sdev, "Resource path: %s\n",
-                                    ipr_format_resource_path(&res->res_path[0], &buffer[0]));
+                                    ipr_format_res_path(res->res_path, buffer,
+                                                        sizeof(buffer)));
                 return 0;
         }
         spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);