diff options
| author |   Guenter Roeck <linux@roeck-us.net> | 2022-01-23 18:23:22 -0800 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2022-01-24 14:32:47 -0800 |
| commit | 79da533d3cc717ccc05ddbd3190da8a72bc2408b (patch) | |
| tree | adeb04f2f269b20a7c29a28e018877703fd7535c /drivers/hwmon/nct6775.c | |
| parent | hwmon: (adt7470) Prevent divide by zero in adt7470_fan_write() (diff) | |
| download | linux-dev-79da533d3cc717ccc05ddbd3190da8a72bc2408b.tar.xz linux-dev-79da533d3cc717ccc05ddbd3190da8a72bc2408b.zip | |
hwmon: (nct6775) Fix crash in clear_caseopen
Paweł Marciniak reports the following crash, observed when clearing
the chassis intrusion alarm.
BUG: kernel NULL pointer dereference, address: 0000000000000028
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 3 PID: 4815 Comm: bash Tainted: G S 5.16.2-200.fc35.x86_64 #1
Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z97 Extreme4, BIOS P2.60A 05/03/2018
RIP: 0010:clear_caseopen+0x5a/0x120 [nct6775]
Code: 68 70 e8 e9 32 b1 e3 85 c0 0f 85 d2 00 00 00 48 83 7c 24 ...
RSP: 0018:ffffabcb02803dd8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff8e8808192880 RSI: 0000000000000000 RDI: ffff8e87c7509a68
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000000a
R10: 000000000000000a R11: f000000000000000 R12: 000000000000001f
R13: ffff8e87c7509828 R14: ffff8e87c7509a68 R15: ffff8e88494527a0
FS: 00007f4db9151740(0000) GS:ffff8e8ebfec0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 0000000166b66001 CR4: 00000000001706e0
Call Trace:
<TASK>
kernfs_fop_write_iter+0x11c/0x1b0
new_sync_write+0x10b/0x180
vfs_write+0x209/0x2a0
ksys_write+0x4f/0xc0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xae
The problem is that the device passed to clear_caseopen() is the hwmon
device, not the platform device, and the platform data is not set in the
hwmon device. Store the pointer to sio_data in struct nct6775_data and
get if from there if needed.
Fixes: 2e7b9886968b ("hwmon: (nct6775) Use superio_*() function pointers in sio_data.")
Cc: Denis Pauk <pauk.denis@gmail.com>
Cc: Bernhard Seibold <mail@bernhard-seibold.de>
Reported-by: Paweł Marciniak <pmarciniak@lodz.home.pl>
Tested-by: Denis Pauk <pauk.denis@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/nct6775.c')
| -rw-r--r-- | drivers/hwmon/nct6775.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index fd3f91cb01c6..098d12b9ecda 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -1175,7 +1175,7 @@ static inline u8 in_to_reg(u32 val, u8 nr) struct nct6775_data { int addr; /* IO base of hw monitor block */ - int sioreg; /* SIO register address */ + struct nct6775_sio_data *sio_data; enum kinds kind; const char *name; @@ -3559,7 +3559,7 @@ clear_caseopen(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct nct6775_data *data = dev_get_drvdata(dev); - struct nct6775_sio_data *sio_data = dev_get_platdata(dev); + struct nct6775_sio_data *sio_data = data->sio_data; int nr = to_sensor_dev_attr(attr)->index - INTRUSION_ALARM_BASE; unsigned long val; u8 reg; @@ -3967,7 +3967,7 @@ static int nct6775_probe(struct platform_device *pdev) return -ENOMEM; data->kind = sio_data->kind; - data->sioreg = sio_data->sioreg; + data->sio_data = sio_data; if (sio_data->access == access_direct) { data->addr = res->start; |