Re: [PATCH] Hamradio: Fix a NULL pointer dereference in net/hamradio/6pack.c

[Eugene Teo <eugene.teo@eugeneteo.net>]

<quote sender="Eugene Teo">
> Pointer sp is dereferenced before NULL check.
> 
> Coverity bug #816
> 
> Signed-off-by: Eugene Teo <eugene.teo@eugeneteo.net>

Ignore the previous patch please. Here's a resend.

--
Pointer sp is dereferenced before NULL check.

Coverity bug #816

Signed-off-by: Eugene Teo <eugene.teo@eugeneteo.net>

--- linux-2.6/drivers/net/hamradio/6pack.c~	2006-03-15 10:05:35.000000000 +0800
+++ linux-2.6/drivers/net/hamradio/6pack.c	2006-03-16 15:08:43.000000000 +0800
@@ -727,12 +727,14 @@ static int sixpack_ioctl(struct tty_stru
 	unsigned int cmd, unsigned long arg)
 {
 	struct sixpack *sp = sp_get(tty);
-	struct net_device *dev = sp->dev;
+	struct net_device *dev;
 	unsigned int tmp, err;
 
 	if (!sp)
 		return -ENXIO;
 
+	dev = sp->dev;
+
 	switch(cmd) {
 	case SIOCGIFNAME:
 		err = copy_to_user((void __user *) arg, dev->name,

-- 
1024D/A6D12F80 print D51D 2633 8DAC 04DB 7265  9BB8 5883 6DAA A6D1 2F80
main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }

-
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