linux-kernel - [PATCH 4.9 57/59] gpiolib: Free the last requested descriptor

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Message-Id: <20181008175553.028491285@linuxfoundation.org>
Date:   Mon,  8 Oct 2018 20:32:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Timur Tabi <timur@...eaurora.org>,
        Jan Lorenzen <jl@...tec.dk>, Jim Paris <jim@...n.com>,
        Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.9 57/59] gpiolib: Free the last requested descriptor

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ricardo Ribalda Delgado <ricardo.ribalda@...il.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@...eaurora.org>
Cc: stable@...r.kernel.org
Fixes: ab3dbcf78f60f46d ("gpioib: do not free unrequested descriptors)
Reported-by: Jan Lorenzen <jl@...tec.dk>
Reported-by: Jim Paris <jim@...n.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);