From: Fabrice Gasnier fabrice.gasnier@foss.st.com
commit e4c3e133294c0a292d21073899b05ebf530169bd upstream.
The ceiling value isn't checked before writing it into registers. The user could write a value higher than the counter resolution (e.g. 16 or 32 bits indicated by max_arr). This makes most significant bits to be truncated. Fix it by checking the max_arr to report a range error [1] to the user.
[1] https://lkml.org/lkml/2021/2/12/358
Fixes: ad29937e206f ("counter: Add STM32 Timer quadrature encoder") Signed-off-by: Fabrice Gasnier fabrice.gasnier@foss.st.com Acked-by: William Breathitt Gray vilhelm.gray@gmail.com Cc: Stable@vger.kernel.org Link: https://lore.kernel.org/r/1614696235-24088-1-git-send-email-fabrice.gasnier@... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/counter/stm32-timer-cnt.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/counter/stm32-timer-cnt.c +++ b/drivers/counter/stm32-timer-cnt.c @@ -25,6 +25,7 @@ struct stm32_timer_cnt { struct regmap *regmap; struct clk *clk; u32 ceiling; + u32 max_arr; };
/** @@ -189,6 +190,9 @@ static ssize_t stm32_count_ceiling_write if (ret) return ret;
+ if (ceiling > priv->max_arr) + return -ERANGE; + /* TIMx_ARR register shouldn't be buffered (ARPE=0) */ regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0); regmap_write(priv->regmap, TIM_ARR, ceiling); @@ -366,6 +370,7 @@ static int stm32_timer_cnt_probe(struct priv->regmap = ddata->regmap; priv->clk = ddata->clk; priv->ceiling = ddata->max_arr; + priv->max_arr = ddata->max_arr;
priv->counter.name = dev_name(dev); priv->counter.parent = dev;