/*
 * lowlevel.c
 *
 * PURPOSE
 *  Low Level Device Routines for the UDF filesystem
 *
 * COPYRIGHT
 *	This file is distributed under the terms of the GNU General Public
 *	License (GPL). Copies of the GPL can be obtained from:
 *		ftp://prep.ai.mit.edu/pub/gnu/GPL
 *	Each contributing author retains all rights to their own work.
 *
 *  (C) 1999-2001 Ben Fennema
 *
 * HISTORY
 *
 *  03/26/99 blf  Created.
 */

#include "udfdecl.h"

#include <linux/blkdev.h>
#include <linux/cdrom.h>
#include <linux/uaccess.h>

#include "udf_sb.h"

unsigned int udf_get_last_session(struct super_block *sb)
{
	struct cdrom_multisession ms_info;
	unsigned int vol_desc_start;
	struct block_device *bdev = sb->s_bdev;
	int i;

	vol_desc_start = 0;
	ms_info.addr_format = CDROM_LBA;
	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info);

	if (i == 0) {
		udf_debug("XA disk: %s, vol_desc_start=%d\n",
			  ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba);
		if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
			vol_desc_start = ms_info.addr.lba;
	} else {
		udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i);
	}
	return vol_desc_start;
}

unsigned long udf_get_last_block(struct super_block *sb)
{
	struct block_device *bdev = sb->s_bdev;
	unsigned long lblock = 0;

	/*
	 * ioctl failed or returned obviously bogus value?
	 * Try using the device size...
	 */
	if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock) ||
	    lblock == 0)
		lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits;

	if (lblock)
		return lblock - 1;
	else
		return 0;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>ipv4</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='d71b7896886345c53ef1d84bda2bc758554f5d61'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Eric Dumazet &lt;edumazet@google.com&gt;</td><td class='right'>2017-02-03 00:03:26 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-04 19:44:22 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>d71b7896886345c53ef1d84bda2bc758554f5d61</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/ipv4?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>e89546d474872302fd1503e07f25bc48f6983039</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/ipv4?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>net/ipv4</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?id=34b2cef20f19c87999fff3da4071e66937db9644'>34b2cef20f19c87999fff3da4071e66937db9644</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ipv4?id=d71b7896886345c53ef1d84bda2bc758554f5d61&amp;id2=34b2cef20f19c87999fff3da4071e66937db9644'>diff</a>)</td></tr></table>
<div class='commit-subject'>netlabel: out of bound access in cipso_v4_validate()</div><div class='commit-msg'>syzkaller found another out of bound access in ip_options_compile(),
or more exactly in cipso_v4_validate()

Fixes: 20e2a8648596 ("cipso: handle CIPSO options correctly when NetLabel is disabled")
Fixes: 446fda4f2682 ("[NetLabel]: CIPSOv4 engine")
Signed-off-by: Eric Dumazet &lt;edumazet@google.com&gt;
Reported-by: Dmitry Vyukov  &lt;dvyukov@google.com&gt;
Cc: Paul Moore &lt;paul@paul-moore.com&gt;
Acked-by: Paul Moore &lt;paul@paul-moore.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>Diffstat</a> (limited to 'net/ipv4')</div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/ipv4/cipso_ipv4.c?id=d71b7896886345c53ef1d84bda2bc758554f5d61'>net/ipv4/cipso_ipv4.c</a></td><td class='right'>4</td><td class='graph'><table summary='file diffstat' width='4%'><tr><td class='add' style='width: 100.0%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>1 files changed, 4 insertions, 0 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c