diff options
| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-10 11:40:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 15:26:15 +0300 |
| commit | c809ed776e190edfc04f8d6b25a62855b1386a0d (patch) | |
| tree | 792f15722241f9024c6019afdb9fcf104aacde5b | |
| parent | 0ea29dded0c3e33b5da69f3612f5d93983f57779 (diff) | |
| download | linux-c809ed776e190edfc04f8d6b25a62855b1386a0d.tar.xz | |
hwmon: (xgene) Fix use after free bug in xgene_hwmon_remove due to race condition
[ Upstream commit cb090e64cf25602b9adaf32d5dfc9c8bec493cd1 ]
In xgene_hwmon_probe, &ctx->workq is bound with xgene_hwmon_evt_work.
Then it will be started.
If we remove the driver which will call xgene_hwmon_remove to clean up,
there may be unfinished work.
The possible sequence is as follows:
Fix it by finishing the work before cleanup in xgene_hwmon_remove.
CPU0 CPU1
|xgene_hwmon_evt_work
xgene_hwmon_remove |
kfifo_free(&ctx->async_msg_fifo);|
|
|kfifo_out_spinlocked
|//use &ctx->async_msg_fifo
Fixes: 2ca492e22cb7 ("hwmon: (xgene) Fix crash when alarm occurs before driver probe")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Link: https://lore.kernel.org/r/20230310084007.1403388-1-zyytlz.wz@163.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/hwmon/xgene-hwmon.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c index e1be61095532..4f0d111ba05b 100644 --- a/drivers/hwmon/xgene-hwmon.c +++ b/drivers/hwmon/xgene-hwmon.c @@ -751,6 +751,7 @@ static int xgene_hwmon_remove(struct platform_device *pdev) { struct xgene_hwmon_dev *ctx = platform_get_drvdata(pdev); + cancel_work_sync(&ctx->workq); hwmon_device_unregister(ctx->hwmon_dev); kfifo_free(&ctx->async_msg_fifo); if (acpi_disabled) |