linux-kernel - [PATCH] staging: ft1000: fix error path

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Message-Id: <1285491595-377-1-git-send-email-segooon@gmail.com>
Date:	Sun, 26 Sep 2010 12:59:55 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Marek Belisko <marek.belisko@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: ft1000: fix error path

init_ft1000_netdev() calls kfree(netdev) instead of free_netdev(netdev).
It doesn't check kmalloc() return value.
ft1000_read_fifo_reg() doesn't free dr on error and calls kfree(urb)
instead of usb_free_urb(urb).  Also kfree(NULL) is OK.
---
 Compile tested.

 drivers/staging/ft1000/ft1000-usb/ft1000_hw.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/ft1000/ft1000-usb/ft1000_hw.c b/drivers/staging/ft1000/ft1000-usb/ft1000_hw.c
index 51ed0dd..3130843 100644
--- a/drivers/staging/ft1000/ft1000-usb/ft1000_hw.c
+++ b/drivers/staging/ft1000/ft1000-usb/ft1000_hw.c
@@ -1048,7 +1048,7 @@ u16 init_ft1000_netdev(struct ft1000_device *ft1000dev)
         }
         else {
             printk(KERN_ERR "ft1000: Invalid device name\n");
-            kfree(netdev);
+            free_netdev(netdev);
             return STATUS_FAILURE;
         }
     }
@@ -1121,8 +1121,14 @@ u16 init_ft1000_netdev(struct ft1000_device *ft1000dev)
         for (i=0; i<NUM_OF_FREE_BUFFERS; i++) {
             // Get memory for DPRAM_DATA link list
             pdpram_blk = kmalloc ( sizeof(DPRAM_BLK), GFP_KERNEL );
+	    if (pdpram_blk == NULL)
+	        goto err_free;
             // Get a block of memory to store command data
             pdpram_blk->pbuffer = kmalloc ( MAX_CMD_SQSIZE, GFP_KERNEL );
+	    if (pdpram_blk->pbuffer == NULL) {
+		kfree(pdpram_blk);
+		goto err_free;
+	    }
             // link provisioning data
             list_add_tail (&pdpram_blk->list, &freercvpool);
         }
@@ -1131,6 +1137,13 @@ u16 init_ft1000_netdev(struct ft1000_device *ft1000dev)
 
     return STATUS_SUCCESS;
 
+
+err_free:
+	for (i--; i>=0; i--) {
+		kfree(pdpram_blk->pbuffer);
+		kfree(pdpram_blk);
+	}
+	return STATUS_FAILURE;
 }
 
 
@@ -1287,7 +1300,8 @@ static int ft1000_read_fifo_reg(struct ft1000_device *ft1000dev,unsigned int pip
 
     if(!urb || !dr)
     {
-        if(urb) kfree(urb);
+	kfree(dr);
+	usb_free_urb(urb);
         spin_unlock(&ft1000dev->device_lock);
         return -ENOMEM;
     }
-- 
1.7.0.4

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