On Sat, Dec 27, 2014 at 02:26:53AM +0300, Alexey Khoroshilov wrote:
> obd_class_open() ignores error code of try_module_get(),
> while it can lead to race with module unload.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
> ---
> drivers/staging/lustre/lustre/obdclass/linux/linux-module.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c b/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> index 66ceab20c743..bb4bc72ddac7 100644
> --- a/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> +++ b/drivers/staging/lustre/lustre/obdclass/linux/linux-module.c
> @@ -168,8 +168,7 @@ EXPORT_SYMBOL(obd_ioctl_popdata);
> /* opening /dev/obd */
> static int obd_class_open(struct inode *inode, struct file *file)
> {
> - try_module_get(THIS_MODULE);
> - return 0;
> + return try_module_get(THIS_MODULE);
> }
This code is totally wrong and racy and should just be fixed up
properly. No module can lock it's own code, we know better than this.
thanks,
greg k-h
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