diff options
| author | Martin Bachem <m.bachem@gmx.de> | 2008-10-26 13:30:09 +0100 |
|---|---|---|
| committer | Karsten Keil <kkeil@suse.de> | 2009-01-11 17:55:16 +0100 |
| commit | 57de16e612d63138bd2c618449af9d8312466e25 (patch) | |
| tree | 1027256bcb705c76c50eca9aeb1a1075952b408d | |
| parent | c59765042f53a79a7a65585042ff463b69cb248c (diff) | |
BUGFIX: used NULL pointer at ioctl(sk,IMGETDEVINFO,&devinfo) when devinfo.id not registered
daxtar example # modprobe hfcsusb
daxtar example # modprobe mISDN_l1loop
daxtar example # ./misdnportinfo
Found 3 devices
id: 0
Dprotocols: 00000006
Bprotocols: 0000000e
protocol: 0
nrbchan: 2
name: HFC-S_USB.1
id: 1
Dprotocols: 00000006
Bprotocols: 0000000e
protocol: 0
nrbchan: 2
name: mISDN_l1loop.1
id: 2
Dprotocols: 00000006
Bprotocols: 0000000e
protocol: 0
nrbchan: 2
name: mISDN_l1loop.2
daxtar example # rmmod hfcsusb
daxtar example # ./misdnportinfo
Found 2 devices
*Segmentation* *fault*
dmesg:
[ 9914.939718] BUG: unable to handle kernel NULL pointer dereference at 000000d4
[ 9914.939721] IP: [<f8f9f2dd>] :mISDN_core:get_mdevice+0x19/0x22
[ 9914.939729] *pde = 00000000
[ 9914.939732] Oops: 0000 [#14] PREEMPT SMP
[ 9914.939734] Modules linked in: mISDN_l1loop mISDN_core vmnet vmblock vmci vmmon coretemp w83627ehf hwmon_vid rfcomm l2cap blue
tooth usbhid snd_usb_audio snd_usb_lib snd_rawmidi snd_hwdep fuse nvidia(P) uhci_hcd i2c_i801 ehci_hcd snd_hda_intel atl1 usbcore i2c_core parport_seria
l [last unloaded: hfcsusb]
[ 9914.939751] Pid: 29618, comm: misdnportinfo Tainted: P D (2.6.27.3 #5)
[ 9914.939753] EIP: 0060:[<f8f9f2dd>] EFLAGS: 00210246 CPU: 0
[ 9914.939758] EIP is at get_mdevice+0x19/0x22 [mISDN_core]
[ 9914.939760] EAX: 00000000 EBX: f8fa791c ECX: f6afaa58 EDX: f7960cf4
[ 9914.939762] ESI: 80044944 EDI: bfc2e62c EBP: bfc2e62c ESP: f5adbef4
[ 9914.939763] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 9914.939765] Process misdnportinfo (pid: 29618, ti=f5ada000 task=f6bec430 task.ti=f5ada000)
[ 9914.939767] Stack: f8f9f4e0 00000000 f8f9f867 bfc2e62c 0000000a c02461e8 00200246 c042dde8
[ 9914.939771] 00000003 c042dde4 00000000 00000001 00200082 c0114775 00000000 00000000
[ 9914.939775] 00000003 f7088010 00200282 f8fa791c 80044944 bfc2e62c bfc2e62c c02f6615
[ 9914.939780] Call Trace:
[ 9914.939782] [<f8f9f4e0>] _get_mdevice+0x0/0x18 [mISDN_core]
[ 9914.939789] [<f8f9f867>] base_sock_ioctl+0x7a/0x129 [mISDN_core]
[ 9914.939789] [<c02461e8>] opost+0x171/0x182
[ 9914.939789] [<c0114775>] __wake_up+0x29/0x39
[ 9914.939789] [<c02f6615>] sock_ioctl+0x1b5/0x1d9
[ 9914.939789] [<c02f6460>] sock_ioctl+0x0/0x1d9
[ 9914.939789] [<c016794c>] vfs_ioctl+0x1c/0x5d
[ 9914.939789] [<c0167bcb>] do_vfs_ioctl+0x23e/0x24e
[ 9914.939789] [<c0167c07>] sys_ioctl+0x2c/0x45
[ 9914.939789] [<c0102cbd>] sysenter_do_call+0x12/0x21
[ 9914.939789] [<c0350000>] pci_fixup_i450gx+0x4e/0x56
[ 9914.939789] =======================
[ 9914.939789] Code: 00 68 02 f0 f9 f8 e8 ae b4 2c c7 8b 44 24 04 5a 59 c3 83 ec 04 31 d2 89 04 24 89 e1 b8 ac df fa f8 68 e0 f4
f9 f8 e8 4a b5 2c c7 <8b> 80 d4 00 00 00 5a 59 c3 53 89 cb 8d 90 9c 00 00 00 89 c8 e8
[ 9914.939789] EIP: [<f8f9f2dd>] get_mdevice+0x19/0x22 [mISDN_core] SS:ESP 0068:f5adbef4
[ 9914.939858] ---[ end trace 50e18a715b019424 ]---
Signed-off-by: Martin Bachem <m.bachem@gmx.de>
Signed-off-by: Karsten Keil <kkeil@suse.de>
| -rw-r--r-- | include/linux/mISDNif.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h index 557477ac3d5..5da3d95b27f 100644 --- a/include/linux/mISDNif.h +++ b/include/linux/mISDNif.h @@ -559,7 +559,10 @@ extern void mISDN_unregister_clock(struct mISDNclock *); static inline struct mISDNdevice *dev_to_mISDN(struct device *dev) { - return dev_get_drvdata(dev); + if (dev) + return dev_get_drvdata(dev); + else + return NULL; } extern void set_channel_address(struct mISDNchannel *, u_int, u_int); |