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
pm6764tr.rst
.. SPDX-License-Identifier: GPL-2.0-only
Kernel driver pm6764tr
======================
Supported chips:
* ST PM6764TR
Prefix: 'pm6764tr'
Addresses scanned: -
Datasheet: http://www.st.com/resource/en/data_brief/pm6764.pdf
Authors:
<hsu.yungteng@gmail.com>
Description:
------------
This driver supports the STMicroelectronics PM6764TR chip. The PM6764TR is a high
performance digital controller designed to power Intel's VR12.5 processors and memories.
The device utilizes digital technology to implement all control and power management
functions to provide maximum flexibility and performance. The NVM is embedded to store
custom configurations. The PM6764TR device features up to 4-phase programmable operation.
The PM6764TR supports power state transitions featuring VFDE, and programmable DPM
maintaining the best efficiency over all loading conditions without compromising transient
response. The device assures fast and independent protection against load overcurrent,
under/overvoltage and feedback disconnections.
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