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>
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nct7802.rst
Kernel driver nct7802
=====================
Supported chips:
* Nuvoton NCT7802Y
Prefix: 'nct7802'
Addresses scanned: I2C 0x28..0x2f
Datasheet: Available from Nuvoton web site
Authors:
Guenter Roeck <linux@roeck-us.net>
Description
-----------
This driver implements support for the Nuvoton NCT7802Y hardware monitoring
chip. NCT7802Y supports 6 temperature sensors, 5 voltage sensors, and 3 fan
speed sensors.
Smart Fan™ speed control is available via pwmX_auto_point attributes.
Tested Boards and BIOS Versions
-------------------------------
The driver has been reported to work with the following boards and
BIOS versions.
======================= ===============================================
Board BIOS version
======================= ===============================================
Kontron COMe-bSC2 CHR2E934.001.GGO
Kontron COMe-bIP2 CCR2E212
======================= ===============================================
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