4.9-stable review patch. If anyone has any objections, please let me know.
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From: Ricardo Ribalda Delgado ricardo.ribalda@gmail.com
commit 19a4fbffc94e41abaa2a623a25ce2641d69eccf0 upstream.
The current code only frees N-1 gpios if an error occurs during gpiod_set_transitory, gpiod_direction_output or gpiod_direction_input. Leading to gpios that cannot be used by userspace nor other drivers.
Cc: Timur Tabi timur@codeaurora.org Cc: stable@vger.kernel.org Fixes: ab3dbcf78f60f46d ("gpioib: do not free unrequested descriptors) Reported-by: Jan Lorenzen jl@newtec.dk Reported-by: Jim Paris jim@jtan.com Signed-off-by: Ricardo Ribalda Delgado ricardo.ribalda@gmail.com Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpio/gpiolib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -471,7 +471,7 @@ static int linehandle_create(struct gpio if (ret) goto out_free_descs; lh->descs[i] = desc; - count = i; + count = i + 1;
if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) set_bit(FLAG_ACTIVE_LOW, &desc->flags);