/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010, 2011, 2012 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>

#include "built_in.h"
#include "tprintf.h"
#include "pkt_buff.h"
#include "proto.h"
#include "protos.h"
#include "dissector.h"
#include "dissector_eth.h"
#include "dissector_80211.h"

int dissector_set_print_type(void *ptr, int type)
{
	struct protocol *proto;

	for (proto = ptr; proto; proto = proto->next) {
		switch (type) {
		case PRINT_NORM:
			proto->process = proto->print_full;
			break;
		case PRINT_LESS:
			proto->process = proto->print_less;
			break;
		default:
			proto->process = NULL;
			break;
		}
	}

	return 0;
}

static void dissector_main(struct pkt_buff *pkt, struct protocol *start,
			   struct protocol *end)
{
	struct protocol *proto;

	if (!start)
		return;

	for (pkt->proto = start; pkt->proto; ) {
		if (unlikely(!pkt->proto->process))
			break;

		proto = pkt->proto;
		pkt->proto = NULL;
		proto->process(pkt);
	}

	if (end && likely(end->process))
		end->process(pkt);
}

void dissector_entry_point(uint8_t *packet, size_t len, int linktype, int mode)
{
	struct protocol *proto_start, *proto_end;
	struct pkt_buff *pkt = NULL;

	if (mode == PRINT_NONE)
		return;

	pkt = pkt_alloc(packet, len);

	switch (linktype) {
	case LINKTYPE_EN10MB:
	case ___constant_swab32(LINKTYPE_EN10MB):
		proto_start = dissector_get_ethernet_entry_point();
		proto_end = dissector_get_ethernet_exit_point();
		break;
	case LINKTYPE_IEEE802_11:
	case ___constant_swab32(LINKTYPE_IEEE802_11):
		proto_start = dissector_get_ieee80211_entry_point();
		proto_end = dissector_get_ieee80211_exit_point();
		break;
	default:
		panic("Linktype not supported!\n");
	};

	dissector_main(pkt, proto_start, proto_end);

	switch (mode) {
	case PRINT_HEX:
		hex(pkt);
		break;
	case PRINT_ASCII:
		ascii(pkt);
		break;
	case PRINT_HEX_ASCII:
		hex_ascii(pkt);
		break;
	}

	tprintf_flush();
	pkt_free(pkt);
}

void dissector_init_all(int fnttype)
{
	dissector_init_ethernet(fnttype);
	dissector_init_ieee80211(fnttype);
}

void dissector_cleanup_all(void)
{
	dissector_cleanup_ethernet();
	dissector_cleanup_ieee80211();
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>drivers</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'/><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>Jes Sorensen &lt;Jes.Sorensen@redhat.com&gt;</td><td class='right'>2017-01-17 18:18:56 -0500</td></tr>
<tr><th>committer</th><td>Kalle Valo &lt;kvalo@codeaurora.org&gt;</td><td class='right'>2017-01-20 11:49:01 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>ec8c26b005033160b1725add81a509511331fab6</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>drivers</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=5407fd7de69f3352aed659244d4bef18e3cabf5c'>5407fd7de69f3352aed659244d4bef18e3cabf5c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9&amp;id2=5407fd7de69f3352aed659244d4bef18e3cabf5c'>diff</a>)</td></tr></table>
<div class='commit-subject'>rtl8xxxu: Update author/maintainer contact info</div><div class='commit-msg'>Update copyright year and email address.

Signed-off-by: Jes Sorensen &lt;Jes.Sorensen@gmail.com&gt;
Signed-off-by: Kalle Valo &lt;kvalo@codeaurora.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1ee83789fc1fb40f4d2f3dddd838c2c3860dadb9'>Diffstat</a> (limited to 'drivers')</div><table summary='diffstat' class='diffstat'>n_fb_obj()</div><div class='commit-msg'>I've seen this trigger twice now, where the i915_gem_object_to_ggtt()
call in intel_unpin_fb_obj() returns NULL, resulting in an oops
immediately afterwards as the (inlined) call to i915_vma_unpin_fence()
tries to dereference it.

It seems to be some race condition where the object is going away at
shutdown time, since both times happened when shutting down the X
server.  The call chains were different:

 - VT ioctl(KDSETMODE, KD_TEXT):

    intel_cleanup_plane_fb+0x5b/0xa0 [i915]
    drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper]
    intel_atomic_commit_tail+0x749/0xfe0 [i915]
    intel_atomic_commit+0x3cb/0x4f0 [i915]
    drm_atomic_commit+0x4b/0x50 [drm]
    restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper]
    drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper]
    drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper]
    intel_fbdev_set_par+0x18/0x70 [i915]
    fb_set_var+0x236/0x460
    fbcon_blank+0x30f/0x350
    do_unblank_screen+0xd2/0x1a0
    vt_ioctl+0x507/0x12a0
    tty_ioctl+0x355/0xc30
    do_vfs_ioctl+0xa3/0x5e0
    SyS_ioctl+0x79/0x90
    entry_SYSCALL_64_fastpath+0x13/0x94

 - i915 unpin_work workqueue:

    intel_unpin_work_fn+0x58/0x140 [i915]
    process_one_work+0x1f1/0x480
    worker_thread+0x48/0x4d0
    kthread+0x101/0x140

and this patch purely papers over the issue by adding a NULL pointer
check and a WARN_ON_ONCE() to avoid the oops that would then generally
make the machine unresponsive.

Other callers of i915_gem_object_to_ggtt() seem to also check for the
returned pointer being NULL and warn about it, so this clearly has
happened before in other places.

[ Reported it originally to the i915 developers on Jan 8, applying the
  ugly workaround on my own now after triggering the problem for the
  second time with no feedback.

  This is likely to be the same bug reported as

     https://bugs.freedesktop.org/show_bug.cgi?id=98829
     https://bugs.freedesktop.org/show_bug.cgi?id=99134

  which has a patch for the underlying problem, but it hasn't gotten to
  me, so I'm applying the workaround. ]

Cc: Daniel Vetter &lt;daniel.vetter@intel.com&gt;
Cc: Jani Nikula &lt;jani.nikula@linux.intel.com&gt;
Cc: Ville Syrjälä &lt;ville.syrjala@linux.intel.com&gt;
Cc: Chris Wilson &lt;chris@chris-wilson.co.uk&gt;
Cc: Maarten Lankhorst &lt;maarten.lankhorst@linux.intel.com&gt;
Cc: Tvrtko Ursulin &lt;tvrtko.ursulin@intel.com&gt;
Cc: Imre Deak &lt;imre.deak@intel.com&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=39cb2c9a316e77f6dfba96c543e55b6672d5a37e'>Diffstat</a> (limited to 'fs/xfs/xfs_iomap.c')</div><table summary='diffstat' class='diffstat'>