[PATCH] orinoco: Change orinoco_translate_scan() to return error code on error.

Signed-off-by: Pavel Roskin <proski@gnu.org>

diff-tree 8fc038ec51acf5f777fade80c5e38112b766aeee (from ca955293cdfd3139e150d3b4fed3922a7eb651fb)
Author: Pavel Roskin <proski@gnu.org>
Date:   Thu Sep 1 19:10:12 2005 -0400

    Change orinoco_translate_scan() to return error code on error.
    Adjust the caller to check for errors and clean up if needed.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 43 insertions, 28 deletions

diff --git a/drivers/net/wireless/orinoco.c b/drivers/net/wireless/orinoco.c
index d7947358e49d..223d35795350 100644
--- a/drivers/net/wireless/orinoco.c
+++ b/drivers/net/wireless/orinoco.c
@@ -4021,7 +4021,8 @@ static int orinoco_ioctl_setscan(struct net_device *dev,
 }
 
 /* Translate scan data returned from the card to a card independant
- * format that the Wireless Tools will understand - Jean II */
+ * format that the Wireless Tools will understand - Jean II
+ * Return message length or -errno for fatal errors */
 static inline int orinoco_translate_scan(struct net_device *dev,
                                          char *buffer,
                                          char *scan,
@@ -4061,13 +4062,19 @@ static inline int orinoco_translate_scan(struct net_device *dev,
                 break;
         case FIRMWARE_TYPE_INTERSIL:
                 offset = 4;
-                if (priv->has_hostscan)
-                        atom_len = scan[0] + (scan[1] << 8);
-                else
+                if (priv->has_hostscan) {
+                        atom_len = le16_to_cpup((u16 *)scan);
+                        /* Sanity check for atom_len */
+                        if (atom_len < sizeof(struct prism2_scan_apinfo)) {
+                                printk(KERN_ERR "%s: Invalid atom_len in scan data: %d\n",
+                                dev->name, atom_len);
+                                return -EIO;
+                        }
+                } else
                         atom_len = offsetof(struct prism2_scan_apinfo, atim);
                 break;
         default:
-                return 0;
+                return -EOPNOTSUPP;
         }
 
         /* Check that we got an whole number of atoms */
@@ -4075,7 +4082,7 @@ static inline int orinoco_translate_scan(struct net_device *dev,
                 printk(KERN_ERR "%s: Unexpected scan data length %d, "
                        "atom_len %d, offset %d\n", dev->name, scan_len,
                        atom_len, offset);
-                return 0;
+                return -EIO;
         }
 
         /* Read the entries one by one */
@@ -4210,33 +4217,41 @@ static int orinoco_ioctl_getscan(struct net_device *dev,
                 /* We have some results to push back to user space */
 
                 /* Translate to WE format */
-                srq->length = orinoco_translate_scan(dev, extra,
-                                                     priv->scan_result,
-                                                     priv->scan_len);
-
-                /* Return flags */
-                srq->flags = (__u16) priv->scan_mode;
+                int ret = orinoco_translate_scan(dev, extra,
+                                                 priv->scan_result,
+                                                 priv->scan_len);
+
+                if (ret < 0) {
+                        err = ret;
+                        kfree(priv->scan_result);
+                        priv->scan_result = NULL;
+                } else {
+                        srq->length = ret;
 
-                /* Results are here, so scan no longer in progress */
-                priv->scan_inprogress = 0;
+                        /* Return flags */
+                        srq->flags = (__u16) priv->scan_mode;
 
-                /* In any case, Scan results will be cleaned up in the
-                 * reset function and when exiting the driver.
-                 * The person triggering the scanning may never come to
-                 * pick the results, so we need to do it in those places.
-                 * Jean II */
+                        /* In any case, Scan results will be cleaned up in the
+                         * reset function and when exiting the driver.
+                         * The person triggering the scanning may never come to
+                         * pick the results, so we need to do it in those places.
+                         * Jean II */
 
 #ifdef SCAN_SINGLE_READ
-                /* If you enable this option, only one client (the first
-                 * one) will be able to read the result (and only one
-                 * time). If there is multiple concurent clients that
-                 * want to read scan results, this behavior is not
-                 * advisable - Jean II */
-                kfree(priv->scan_result);
-                priv->scan_result = NULL;
+                        /* If you enable this option, only one client (the first
+                         * one) will be able to read the result (and only one
+                         * time). If there is multiple concurent clients that
+                         * want to read scan results, this behavior is not
+                         * advisable - Jean II */
+                        kfree(priv->scan_result);
+                        priv->scan_result = NULL;
 #endif /* SCAN_SINGLE_READ */
-                /* Here, if too much time has elapsed since last scan,
-                 * we may want to clean up scan results... - Jean II */
+                        /* Here, if too much time has elapsed since last scan,
+                         * we may want to clean up scan results... - Jean II */
+                }
+
+                /* Scan is no longer in progress */
+                priv->scan_inprogress = 0;
         }
           
         orinoco_unlock(priv, &flags);