| Message ID | 20190919151137.9960-1-TheSven73@gmail.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | [v1] power: supply: ltc2941-battery-gauge: fix use-after-free | expand |
On Thu, Sep 19, 2019 at 2:29 PM Sasha Levin <sashal@kernel.org> wrote: > > Hi, > > [This is an automated email] > > This commit has been processed because it contains a -stable tag. > The stable tag indicates that it's relevant for the following trees: all > > The bot has tested the following trees: v5.2.15, v4.19.73, v4.14.144, v4.9.193, v4.4.193. > > v5.2.15: Build OK! > v4.19.73: Build OK! > v4.14.144: Build OK! > v4.9.193: Build OK! > v4.4.193: Failed to apply! Possible dependencies: > Unable to calculate > > > NOTE: The patch will not be queued to stable trees until it is upstream. > > How should we proceed with this patch? > > -- > Thanks, > Sasha Doesn't apply on 4.4 because power supply drivers moved to a different directory (power/supply) between 4.4 and 4.9. I will post a patch with a fixed-up file path, marked as "[PATCH 4.4 v1]". If this should be addressed differently, please let me know. Sven
Hi, On Thu, Sep 19, 2019 at 11:11:37AM -0400, Sven Van Asbroeck wrote: > This driver's remove path calls cancel_delayed_work(). > However, that function does not wait until the work function > finishes. This could mean that the work function is still > running after the driver's remove function has finished, > which would result in a use-after-free. > > Fix by calling cancel_delayed_work_sync(), which ensures that > that the work is properly cancelled, no longer running, and > unable to re-schedule itself. > > This issue was detected with the help of Coccinelle. > > Cc: stable <stable@vger.kernel.org> > Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com> > --- Thanks, queued. -- Sebastian > drivers/power/supply/ltc2941-battery-gauge.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c > index da49436176cd..30a9014b2f95 100644 > --- a/drivers/power/supply/ltc2941-battery-gauge.c > +++ b/drivers/power/supply/ltc2941-battery-gauge.c > @@ -449,7 +449,7 @@ static int ltc294x_i2c_remove(struct i2c_client *client) > { > struct ltc294x_info *info = i2c_get_clientdata(client); > > - cancel_delayed_work(&info->work); > + cancel_delayed_work_sync(&info->work); > power_supply_unregister(info->supply); > return 0; > } > -- > 2.17.1 >
diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c index da49436176cd..30a9014b2f95 100644 --- a/drivers/power/supply/ltc2941-battery-gauge.c +++ b/drivers/power/supply/ltc2941-battery-gauge.c @@ -449,7 +449,7 @@ static int ltc294x_i2c_remove(struct i2c_client *client) { struct ltc294x_info *info = i2c_get_clientdata(client); - cancel_delayed_work(&info->work); + cancel_delayed_work_sync(&info->work); power_supply_unregister(info->supply); return 0; }
This driver's remove path calls cancel_delayed_work(). However, that function does not wait until the work function finishes. This could mean that the work function is still running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling cancel_delayed_work_sync(), which ensures that that the work is properly cancelled, no longer running, and unable to re-schedule itself. This issue was detected with the help of Coccinelle. Cc: stable <stable@vger.kernel.org> Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com> --- drivers/power/supply/ltc2941-battery-gauge.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)