6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Antonio Borneo antonio.borneo@foss.st.com
[ Upstream commit edd48fd9d45370d6c8ba0dd834fcc51ff688cc87 ]
The existing code does not verify if the "tentative" index exceeds the size of the array, causing out of bound read. Issue identified with kasan.
Check the index before using it.
Signed-off-by: Antonio Borneo antonio.borneo@foss.st.com Fixes: 32c170ff15b0 ("pinctrl: stm32: set default gpio line names using pin names") Link: https://lore.kernel.org/r/20231107110520.4449-1-antonio.borneo@foss.st.com Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pinctrl/stm32/pinctrl-stm32.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c index 419eca49ccecb..346a31f31bba8 100644 --- a/drivers/pinctrl/stm32/pinctrl-stm32.c +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c @@ -1283,9 +1283,11 @@ static struct stm32_desc_pin *stm32_pctrl_get_desc_pin_from_gpio(struct stm32_pi int i;
/* With few exceptions (e.g. bank 'Z'), pin number matches with pin index in array */ - pin_desc = pctl->pins + stm32_pin_nb; - if (pin_desc->pin.number == stm32_pin_nb) - return pin_desc; + if (stm32_pin_nb < pctl->npins) { + pin_desc = pctl->pins + stm32_pin_nb; + if (pin_desc->pin.number == stm32_pin_nb) + return pin_desc; + }
/* Otherwise, loop all array to find the pin with the right number */ for (i = 0; i < pctl->npins; i++) {