gpioib: do not free unrequested descriptors

If the main loop in linehandle_create() encounters an error, it
unwinds completely by freeing all previously requested GPIO
descriptors.  However, if the error occurs in the beginning of
the loop before that GPIO is requested, then the exit code
attempts to free a null descriptor.  If extrachecks is enabled,
gpiod_free() triggers a WARN_ON.

Instead, keep a separate count of legitimate GPIOs so that only
those are freed.

Cc: stable@vger.kernel.org
Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines")
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 43aeb07343ec76fe3eeef0283d8d52327530bfdf..d07771797707b5c2bd7fa6daef0c551999fec97b 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -497,7 +497,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
        struct gpiohandle_request handlereq;
        struct linehandle_state *lh;
        struct file *file;
-       int fd, i, ret;
+       int fd, i, count = 0, ret;
        u32 lflags;
 
        if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
@@ -558,6 +558,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
                if (ret)
                        goto out_free_descs;
                lh->descs[i] = desc;
+               count = i;
 
                if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
                        set_bit(FLAG_ACTIVE_LOW, &desc->flags);
@@ -628,7 +629,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 out_put_unused_fd:
        put_unused_fd(fd);
 out_free_descs:
-       for (; i >= 0; i--)
+       for (i = 0; i < count; i++)
                gpiod_free(lh->descs[i]);
        kfree(lh->label);
 out_free_lh: