linux-kernel - [git bisect regression 3.15-rc1] NULL ptr deref in ichx_gpio

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Date:	Mon, 14 Apr 2014 13:55:07 -0400
From:	Eric Paris <eparis@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	ptyser@...-inc.com, linus.walleij@...aro.org, gnurou@...il.com,
	linux-gpio@...r.kernel.org, vdonnefort@...il.com
Subject: [git bisect regression 3.15-rc1] NULL ptr deref in ichx_gpio_probe

I cannot boot 3.15-rc1 kernels because I get a NULL ptr bug in
ichx_gpio_probe.  The backtrace is at the end of the e-mail.  I did a
bisect and found:

$ git bisect good
b667cf488aa9476b0ab64acd91f2a96f188cfd21 is the first bad commit
commit b667cf488aa9476b0ab64acd91f2a96f188cfd21
Author: Vincent Donnefort <vdonnefort@...il.com>
Date:   Fri Feb 7 14:21:05 2014 +0100

    gpio: ich: Add support for multiple register addresses

    This patch introduces regs and reglen pointers which allow a chipset to have
    register addresses differing from ICH ones.

    Signed-off-by: Vincent Donnefort <vdonnefort@...il.com>
    Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

:040000 040000 f69690db4ff26eb01553bbc33679bf43d9054948 889bd1726d656d0a274edbc41c220e67e6151500 M      drivers

I am attaching the full dmesg from that boot as possibly other
information will be helpful...

The Backtrace:

[   18.021255] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   18.021617] IP: [<ffffffffa02a46a0>] ichx_gpio_probe+0x2a0/0x41c [gpio_ich]
[   18.021918] PGD 0
[   18.022011] Oops: 0000 [#1] SMP
[   18.022011] Modules linked in: gpio_ich(+) snd_seq_device snd_pcm i5400_edac joydev edac_core parport_pc snd_timer lpc_ich shpchp parport tpm_tis snd soundcore microcode i2c_i801 serio_raw mfd_core i5k_amb tpm nouveau hid_logitech_dj video mxm_wmi wmi i2c_algo_bit drm_kms_helper ttm drm ata_generic tg3 pata_acpi ptp pps_core i2c_core
[   18.022011] CPU: 5 PID: 553 Comm: systemd-udevd Not tainted 3.14.0-rc1+ #9
[   18.022011] Hardware name: Dell Inc. Precision WorkStation T5400  /0RW203, BIOS A04 08/21/2008
[   18.022011] task: ffff880033e2cc50 ti: ffff88044ba26000 task.ti: ffff88044ba26000
[   18.022011] RIP: 0010:[<ffffffffa02a46a0>]  [<ffffffffa02a46a0>] ichx_gpio_probe+0x2a0/0x41c [gpio_ich]
[   18.022011] RSP: 0018:ffff88044ba27ba0  EFLAGS: 00010246
[   18.022011] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   18.022011] RDX: 0000000000000000 RSI: 0000000000000100 RDI: ffffffff81c3e180
[   18.022011] RBP: ffff88044ba27bd0 R08: 0000000000000000 R09: ffff880034fb04b0
[   18.022011] R10: 0000000000000001 R11: ffff880033e2d7f0 R12: ffff880034fb0000
[   18.022011] R13: ffff88044c28dcc0 R14: 0000000000000003 R15: 0000000000000000
[   18.022011] FS:  00007fbc8df5f880(0000) GS:ffff88045e000000(0000) knlGS:0000000000000000
[   18.022011] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.022011] CR2: 0000000000000000 CR3: 000000044b95e000 CR4: 00000000000007e0
[   18.022011] Stack:
[   18.022011]  ffff880034fb04b0 ffff880034fb0010 ffffffffa02a6028 ffff880034fb0000
[   18.022011]  0000000000000000 0000000000000001 ffff88044ba27c00 ffffffff814f4a55
[   18.022011]  ffffffff814f21a2 ffff880034fb0010 0000000000000000 ffffffffa02a6028
[   18.022011] Call Trace:
[   18.022011]  [<ffffffff814f4a55>] platform_drv_probe+0x45/0xb0
[   18.022011]  [<ffffffff814f21a2>] ? driver_sysfs_add+0x82/0xb0
[   18.022011]  [<ffffffff814f2945>] driver_probe_device+0x125/0x3a0
[   18.022011]  [<ffffffff814f2c93>] __driver_attach+0x93/0xa0
[   18.022011]  [<ffffffff814f2c00>] ? __device_attach+0x40/0x40
[   18.022011]  [<ffffffff814f0683>] bus_for_each_dev+0x73/0xc0
[   18.022011]  [<ffffffff814f22ce>] driver_attach+0x1e/0x20
[   18.022011]  [<ffffffff814f1e78>] bus_add_driver+0x188/0x260
[   18.022011]  [<ffffffffa00d0000>] ? 0xffffffffa00cffff
[   18.022011]  [<ffffffff814f3334>] driver_register+0x64/0xf0
[   18.022011]  [<ffffffffa00d0000>] ? 0xffffffffa00cffff
[   18.022011]  [<ffffffff814f497a>] __platform_driver_register+0x4a/0x50
[   18.022011]  [<ffffffffa00d0017>] ichx_gpio_driver_init+0x17/0x1000 [gpio_ich]
[   18.022011]  [<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
[   18.022011]  [<ffffffff81063e93>] ? set_memory_nx+0x43/0x50
[   18.022011]  [<ffffffff81130e58>] load_module+0x1c28/0x26d0
[   18.022011]  [<ffffffff8112bff0>] ? store_uevent+0x70/0x70
[   18.022011]  [<ffffffff81236790>] ? kernel_read+0x50/0x80
[   18.022011]  [<ffffffff81131ad6>] SyS_finit_module+0xa6/0xd0
[   18.022011]  [<ffffffff817c9f69>] system_call_fastpath+0x16/0x1b
[   18.022011] Code: 00 00 40 61 2a a0 e9 f0 fd ff ff 48 8b 05 81 1f 00 00 45 31 c0 48 c7 c7 80 e1 c3 81 4c 89 4d d0 48 8b 48 08 48 8b 50 10 48 63 c3 <0f> b6 34 01 0f b6 14 1a 4c 89 c9 49 03 75 00 e8 8c a2 df e0 48
[   18.022011] RIP  [<ffffffffa02a46a0>] ichx_gpio_probe+0x2a0/0x41c [gpio_ich]
[   18.022011]  RSP <ffff88044ba27ba0>
[   18.022011] CR2: 0000000000000000
[   18.047269] ---[ end trace 178b39b238232179 ]---


View attachment "dmesg" of type "text/plain" (69532 bytes)