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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
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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