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Subject2.6.30 PL2303 USB-serial: NULL ptr dereference
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Date
Hi,

Not sure if the following has been reported. I think happened when
closing minicom, with the PL2303-based adapter still connected to USB.

usb 6-1: new full speed USB device using uhci_hcd and address 2
usb 6-1: configuration #1 chosen from 1 choice
usbcore: registered new interface driver usbserial
usbserial: USB Serial Driver core
USB Serial support registered for pl2303
pl2303 6-1:1.0: pl2303 converter detected
usb 6-1: pl2303 converter now attached to ttyUSB0
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
hub 6-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
usb 6-1: USB disconnect, address 2
pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
pl2303 6-1:1.0: device disconnected
usb 6-1: new full speed USB device using uhci_hcd and address 3
usb 6-1: configuration #1 chosen from 1 choice
pl2303 6-1:1.0: pl2303 converter detected
usb 6-1: pl2303 converter now attached to ttyUSB1
hub 6-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
usb 6-1: USB disconnect, address 3
pl2303 ttyUSB1: pl2303 converter now disconnected from ttyUSB1
pl2303 6-1:1.0: device disconnected
usb 6-1: new full speed USB device using uhci_hcd and address 4
usb 6-1: configuration #1 chosen from 1 choice
pl2303 6-1:1.0: pl2303 converter detected
usb 6-1: pl2303 converter now attached to ttyUSB2

Then after two hours, while exiting from minicom (most probably):

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff804dfb38>] _spin_lock_irqsave+0x8/0x20
PGD 0
Oops: 0002 [#1] SMP
last sysfs file: /sys/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB2/port_number
CPU 1
Modules linked in: pl2303 usbserial radeon drm coretemp f71882fg hwmon binfmt_misc sg snd_hda_codec_realtek pcspkr parport_pc snd_hda_intel parport snd_hda_codec snd_pcm snd_timer r8169 snd soundcore snd_page_alloc [last unloaded: scsi_wait_scan]
Pid: 3558, comm: minicom Not tainted 2.6.30 #15 MS-7512
RIP: 0010:[<ffffffff804dfb38>] [<ffffffff804dfb38>] _spin_lock_irqsave+0x8/0x20
RSP: 0018:ffff88013df5dca0 EFLAGS: 00010046
RAX: 0000000000000246 RBX: 0000000000000000 RCX: ffff88013dd51000
RDX: 0000000000010000 RSI: ffff88013e537000 RDI: 0000000000000000
RBP: ffff88013e537000 R08: ffff88013d14a9c0 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88002804a510 R12: ffff88013dd51000
R13: ffff880139dc0180 R14: 0000000000000000 R15: ffffffffa017aaa0
FS: 0000000000000000(0000) GS:ffff88002803a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process minicom (pid: 3558, threadinfo ffff88013df5c000, task ffff88013f1bc7d0)
Stack:
ffffffffa0177c93 ffffffff80231110 0000000000000000 0000000000000000
ffffe20000000002 ffffe2000408cfd8 ffffffff8022d2c0 0000000000080c00
00000001806c6900 0000000000000040 ffff88013e537000 ffff88013dd51000
Call Trace:
[<ffffffffa0177c93>] ? pl2303_close+0x33/0x290 [pl2303]
[<ffffffff80231110>] ? default_wake_function+0x0/0x20
[<ffffffff8022d2c0>] ? __wake_up_common+0x50/0x80
[<ffffffffa016d347>] ? serial_close+0x1e7/0x220 [usbserial]
[<ffffffff8039a3f2>] ? tty_release_dev+0x162/0x580
[<ffffffff8039a821>] ? tty_release+0x11/0x20
[<ffffffff80295482>] ? __fput+0xc2/0x210
[<ffffffff80292046>] ? filp_close+0x56/0x90
[<ffffffff8023a235>] ? put_files_struct+0x75/0xf0
[<ffffffff8023c00e>] ? do_exit+0x65e/0x6d0
[<ffffffff8023c0c5>] ? do_group_exit+0x45/0xb0
[<ffffffff8023c142>] ? sys_exit_group+0x12/0x20
[<ffffffff8020b2eb>] ? system_call_fastpath+0x16/0x1b
Code: 00 00 84 d2 75 09 f0 81 07 00 00 00 01 30 c0 f3 c3 66 90 f0 83 2f 01 79 05 e8 f5 3d e7 ff c3 0f 1f 40 00 9c 58 fa ba 00 00 01 00 <f0> 0f c1 17 0f b7 ca c1 ea 10 39 d1 74 07 f3 90 0f b7 0f eb f5
RIP [<ffffffff804dfb38>] _spin_lock_irqsave+0x8/0x20
RSP <ffff88013df5dca0>
CR2: 0000000000000000
---[ end trace 3989c95d46ef42fc ]---
Fixing recursive fault but reboot is needed!
Few hours later:
usb 6-1: USB disconnect, address 4
pl2303 ttyUSB2: pl2303 converter now disconnected from ttyUSB2
pl2303 6-1:1.0: device disconnected

Additional details available on request.
--
Krzysztof Halasa


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