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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - NULL pointer dereference in Intel HD Graphics driver (i915)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106559">bug 106559</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>ASSIGNED
</td>
<td>RESOLVED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - NULL pointer dereference in Intel HD Graphics driver (i915)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106559#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - NULL pointer dereference in Intel HD Graphics driver (i915)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106559">bug 106559</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>commit e578a570dc7c20475774d1ff993825e3bd7a7011
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri May 18 08:48:40 2018 +0100
drm/i915/lvds: Move acpi lid notification registration to registration
phase
Delay registering ourselves with the acpi lid notification mechanism
until we are registering the connectors after initialisation is
complete. This prevents a possibility of trying to handle the lid
notification before we are ready with the danger of chasing
uninitialised function pointers.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
IP: (null)
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP PTI
Modules linked in: arc4(+) iwldvm(+) i915(+) mac80211 i2c_algo_bit
coretemp mei_wdt iwlwifi drm_kms_helper kvm_intel wmi_bmof iTCO_wdt
iTCO_vendor_support kvm snd_hda_codec_cone
xant snd_hda_codec_generic drm psmouse cfg80211 irqbypass input_leds pcspkr
i2c_i801 snd_hda_intel snd_hda_codec thinkpad_acpi snd_hda_core mei_me lpc_ich
snd_hwdep e1000e wmi nvram
snd_pcm mei snd_timer shpchp ptp pps_core rfkill syscopyarea snd intel_agp
sysfillrect intel_gtt soundcore sysimgblt battery led_class fb_sys_fops ac
rtc_cmos agpgart evdev mac_hid a
cpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 fscrypto
crypto_simd glue_helper cryptd aes_x86_64 xts algif_skcipher af_alg dm_crypt
dm_mod sd_mod uas usb_stor
age serio_raw atkbd libps2 ahci libahci uhci_hcd libata scsi_mod ehci_pci
ehci_hcd usbcore usb_common i8042 serio
CPU: 1 PID: 378 Comm: systemd-logind Not tainted 4.16.8-1-ARCH #1
Hardware name: LENOVO 7454CTO/7454CTO, BIOS 6DET72WW (3.22 ) 10/25/2012
RIP: 0010: (null)
RSP: 0018:ffffaf4580c33a18 EFLAGS: 00010287
RAX: 0000000000000000 RBX: ffff947533558000 RCX: 000000000000003e
RDX: ffffffffc0aa80c0 RSI: ffffaf4580c33a3c RDI: ffff947534e4c000
RBP: ffff947533558338 R08: ffff947534598930 R09: ffffffffc0a928b1
R10: ffffd8f181d5fd40 R11: 0000000000000000 R12: ffffffffc0a928b1
R13: ffff947533558368 R14: ffffffffc0a928a9 R15: ffff947534e4c000
FS: 00007f3dc4ddb940(0000) GS:ffff947539280000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006e214000 CR4: 00000000000406e0
Call Trace:
? intel_modeset_setup_hw_state+0x385/0xf60 [i915]
? __intel_display_resume+0x1e/0xc0 [i915]
? intel_display_resume+0xcc/0x120 [i915]
? intel_lid_notify+0xbc/0xc0 [i915]
? notifier_call_chain+0x47/0x70
? blocking_notifier_call_chain+0x3e/0x60
? acpi_lid_notify_state+0x8f/0x1d0
? acpi_lid_update_state+0x49/0x70
? acpi_lid_input_open+0x60/0x90
? input_open_device+0x5d/0xa0
? evdev_open+0x1ba/0x1e0 [evdev]
? chrdev_open+0xa3/0x1b0
? cdev_put.part.0+0x20/0x20
? do_dentry_open+0x14c/0x300
? path_openat+0x30c/0x1240
? current_time+0x16/0x60
? do_filp_open+0x93/0x100
? __check_object_size+0xfb/0x180
? do_sys_open+0x186/0x210
? do_syscall_64+0x74/0x190
? entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Code: Bad RIP value.
RIP: (null) RSP: ffffaf4580c33a18
CR2: 0000000000000000
Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - NULL pointer dereference in Intel HD Graphics driver (i915)"
href="show_bug.cgi?id=106559">https://bugs.freedesktop.org/show_bug.cgi?id=106559</a>
Fixes: c1c7af608920 ("drm/i915: force mode set at lid open time")
Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Cc: Maarten Lankhorst <<a href="mailto:maarten.lankhorst@linux.intel.com">maarten.lankhorst@linux.intel.com</a>>
Cc: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Cc: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Reviewed-by: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>>
Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20180518074840.16194-1-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20180518074840.16194-1-chris@chris-wilson.co.uk</a>
Cc: <a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a></pre>
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