Revision 7ff57e98fb78ad94edafbdc7435f2d745e9e6bb5 authored by Fabio M. De Francesco on 23 February 2022, 10:02:52 UTC, committed by Jakub Kicinski on 24 February 2022, 17:09:33 UTC
smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib()
which, in turn, calls mutex_lock(&smc_ib_devices.mutex).
read_lock() disables preemption. Therefore, the code acquires a mutex while in
atomic context and it leads to a SAC bug.
Fix this bug by replacing the rwlock with a mutex.
Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
Fixes: 64e28b52c7a6 ("net/smc: add pnet table namespace support")
Confirmed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent e13ad14
w83773g.rst
Kernel driver w83773g
=====================
Supported chips:
* Nuvoton W83773G
Prefix: 'w83773g'
Addresses scanned: I2C 0x4c and 0x4d
Datasheet: https://www.nuvoton.com/resource-files/W83773G_SG_DatasheetV1_2.pdf
Authors:
Lei YU <mine260309@gmail.com>
Description
-----------
This driver implements support for Nuvoton W83773G temperature sensor
chip. This chip implements one local and two remote sensors.
The chip also features offsets for the two remote sensors which get added to
the input readings. The chip does all the scaling by itself and the driver
therefore reports true temperatures that don't need any user-space adjustments.
Temperature is measured in degrees Celsius.
The chip is wired over I2C/SMBus and specified over a temperature
range of -40 to +125 degrees Celsius (for local sensor) and -40 to +127
degrees Celsius (for remote sensors).
Resolution for both the local and remote channels is 0.125 degree C.
The chip supports only temperature measurement. The driver exports
the temperature values via the following sysfs files:
**temp[1-3]_input, temp[2-3]_fault, temp[2-3]_offset, update_interval**
Computing file changes ...
