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| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-10 16:40:07 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 13:33:52 +0100 |
| commit | b2ae1f15cd6fe0cb36e432a179ae7d479ae2e6e0 (patch) | |
| tree | d7d2d6c175ef7f4a8900e4bf30a47d4211a23dca /drivers/hwmon | |
| parent | afda11bae889d22b1068928e65203e321606b98b (diff) | |
| download | linux-b2ae1f15cd6fe0cb36e432a179ae7d479ae2e6e0.tar.gz | |
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>
Diffstat (limited to 'drivers/hwmon')
| -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 5cde837bfd09..d1abea49f01b 100644 --- a/drivers/hwmon/xgene-hwmon.c +++ b/drivers/hwmon/xgene-hwmon.c @@ -761,6 +761,7 @@ 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) |