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| author |   Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> | 2020-08-07 16:59:02 +0530 |
|---|---|---|
| committer |   Wim Van Sebroeck <wim@linux-watchdog.org> | 2020-10-14 15:02:21 +0200 |
| commit | 4b2e7f99cdd314263c9d172bc17193b8b6bba463 (patch) | |
| tree | e6c4a60c323581fa36a9a68cee62ef2ebf1b93e7 /drivers/watchdog | |
| parent | Linux 5.9-rc7 (diff) | |
| download | linux-dev-4b2e7f99cdd314263c9d172bc17193b8b6bba463.tar.xz linux-dev-4b2e7f99cdd314263c9d172bc17193b8b6bba463.zip | |
drivers: watchdog: rdc321x_wdt: Fix race condition bugs
In rdc321x_wdt_probe(), rdc321x_wdt_device.queue is initialized
after misc_register(), hence if ioctl is called before its
initialization which can call rdc321x_wdt_start() function,
it will see an uninitialized value of rdc321x_wdt_device.queue,
hence initialize it before misc_register().
Also, rdc321x_wdt_device.default_ticks is accessed in reset()
function called from write callback, thus initialize it before
misc_register().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20200807112902.28764-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/rdc321x_wdt.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/watchdog/rdc321x_wdt.c b/drivers/watchdog/rdc321x_wdt.c index 57187efeb86f..f0c94ea51c3e 100644 --- a/drivers/watchdog/rdc321x_wdt.c +++ b/drivers/watchdog/rdc321x_wdt.c @@ -231,6 +231,8 @@ static int rdc321x_wdt_probe(struct platform_device *pdev) rdc321x_wdt_device.sb_pdev = pdata->sb_pdev; rdc321x_wdt_device.base_reg = r->start; + rdc321x_wdt_device.queue = 0; + rdc321x_wdt_device.default_ticks = ticks; err = misc_register(&rdc321x_wdt_misc); if (err < 0) { @@ -245,14 +247,11 @@ static int rdc321x_wdt_probe(struct platform_device *pdev) rdc321x_wdt_device.base_reg, RDC_WDT_RST); init_completion(&rdc321x_wdt_device.stop); - rdc321x_wdt_device.queue = 0; clear_bit(0, &rdc321x_wdt_device.inuse); timer_setup(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0); - rdc321x_wdt_device.default_ticks = ticks; - dev_info(&pdev->dev, "watchdog init success\n"); return 0; |