[PATCH v2] usbnet: smsc95xx: dereferencing NULL pointer

[PATCH v2] usbnet: smsc95xx: dereferencing NULL pointer

[Sudip Mukherjee]

we were dereferencing dev to initialize pdata. but just after that we
have a BUG_ON(!dev). so we were basically dereferencing the pointer
first and then tesing it for NULL.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---

change in v2: suspend_flags is initialised after pdata is initialised.
v1 had a very silly but serious mistake of making pdata NULL, and trying
to dereference it.
sorry again for that.

 drivers/net/usb/smsc95xx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index d07bf4c..26423ad 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1670,12 +1670,14 @@ done:
 static int smsc95xx_resume(struct usb_interface *intf)
 {
 	struct usbnet *dev = usb_get_intfdata(intf);
-	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
-	u8 suspend_flags = pdata->suspend_flags;
+	struct smsc95xx_priv *pdata;
+	u8 suspend_flags;
 	int ret;
 	u32 val;
 
 	BUG_ON(!dev);
+	pdata = (struct smsc95xx_priv *)(dev->data[0]);
+	suspend_flags = pdata->suspend_flags;
 
 	netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
 
-- 
1.8.1.2

Re: [PATCH v2] usbnet: smsc95xx: dereferencing NULL pointer

[David Miller]

From: Sudip Mukherjee <sudipm.mukherjee-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Tue, 11 Nov 2014 14:10:47 +0530

> we were dereferencing dev to initialize pdata. but just after that we
> have a BUG_ON(!dev). so we were basically dereferencing the pointer
> first and then tesing it for NULL.
> 
> Signed-off-by: Sudip Mukherjee <sudip-ofJRbWXBVFamYgehrs7/Lw@public.gmane.org>
> ---
> 
> change in v2: suspend_flags is initialised after pdata is initialised.
> v1 had a very silly but serious mistake of making pdata NULL, and trying
> to dereference it.
> sorry again for that.

This looks better, applied, thanks.
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