On Mon, Jul 27, 2020 at 02:20:50PM +0300, Dan Carpenter wrote:
> We need to unlock before returning on this error path.
>
> Fixes: 210bec567936 ("mtd: properly check all write ioctls for permissions")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> drivers/mtd/mtdchar.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
> index 52c120f9fb0d..05f9218592df 100644
> --- a/drivers/mtd/mtdchar.c
> +++ b/drivers/mtd/mtdchar.c
> @@ -1064,8 +1064,10 @@ static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
> struct mtd_oob_buf32 buf;
> struct mtd_oob_buf32 __user *buf_user = argp;
>
> - if (!(file->f_mode & FMODE_WRITE))
> - return -EPERM;
> + if (!(file->f_mode & FMODE_WRITE)) {
> + ret = -EPERM;
> + goto unlock;
> + }
>
> if (copy_from_user(&buf, argp, sizeof(buf)))
> ret = -EFAULT;
> @@ -1117,6 +1119,7 @@ static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
> ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
> }
>
> +unlock:
> mutex_unlock(&mtd_mutex);
>
> return ret;
> --
> 2.27.0
>
I think this is already fixed up in the mtd tree.
thanks,
greg k-h
