netdev - Re: [patch] isdn: fix a wrapping bug in isdn_ppp

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Date:	Wed, 10 Oct 2012 14:05:01 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Karsten Keil <isdn@...ux-pingi.de>,
	"David S. Miller" <davem@...emloft.net>,
	Masanari Iida <standby24x7@...il.com>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] isdn: fix a wrapping bug in isdn_ppp_ioctl()

Joe Perches <joe@...ches.com> writes:

> @@ -589,16 +589,15 @@ isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
>  		break;
>  	case PPPIOCGCOMPRESSORS:
>  	{
> -		unsigned long protos[8] = {0,};
> +		DECLARE_BITMAP(protos, BITS_PER_LONG * 8) = { 0, };
>  		struct isdn_ppp_compressor *ipc = ipc_head;
> +
>  		while (ipc) {
> -			j = ipc->num / (sizeof(long) * 8);
> -			i = ipc->num % (sizeof(long) * 8);
> -			if (j < 8)
> -				protos[j] |= (0x1 << i);
> +			if (ipc->num < BITS_PER_LONG * 8)
> +				set_bit(ipc->num, protos);
>  			ipc = ipc->next;
>  		}
> -		if ((r = set_arg(argp, protos, 8 * sizeof(long))))
> +		if ((r = set_arg(argp, protos, sizeof(protos))))

This changes the bit endianess.  Since protos is exported to user space
it is an ABI change.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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