On Tuesday 02 August 2016 03:11 PM, Pavel Andrianov wrote:
> Likely wl3501_reset should acquire spinlock as wl3501_{open, close}.
> One of calls of wl3501_reset has been already protected.
> The others were unprotected and might lead to a race condition.
> The patch adds spinlock into the wl3501_reset and removes it from
> wl3501_tx_timeout.
>
> Found by Linux Driver Verification project (linuxtesting.org)
>
> Signed-off-by: Pavel Andrianov <andrianov@xxxxxxxxx>
Acked-by: Vaishali Thakkar <vaishali.thakkar@xxxxxxxxxx>
> ---
> drivers/net/wireless/wl3501_cs.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/wireless/wl3501_cs.c b/drivers/net/wireless/wl3501_cs.c
> index 13fd734..196f13c 100644
> --- a/drivers/net/wireless/wl3501_cs.c
> +++ b/drivers/net/wireless/wl3501_cs.c
> @@ -1247,7 +1247,9 @@ static int wl3501_reset(struct net_device *dev)
> {
> struct wl3501_card *this = netdev_priv(dev);
> int rc = -ENODEV;
> + unsigned long flags;
>
> + spin_lock_irqsave(&this->lock, flags);
> wl3501_block_interrupt(this);
>
> if (wl3501_init_firmware(this)) {
> @@ -1269,20 +1271,17 @@ static int wl3501_reset(struct net_device *dev)
> pr_debug("%s: device reset", dev->name);
> rc = 0;
> out:
> + spin_unlock_irqrestore(&this->lock, flags);
> return rc;
> }
>
> static void wl3501_tx_timeout(struct net_device *dev)
> {
> - struct wl3501_card *this = netdev_priv(dev);
> struct net_device_stats *stats = &dev->stats;
> - unsigned long flags;
> int rc;
>
> stats->tx_errors++;
> - spin_lock_irqsave(&this->lock, flags);
> rc = wl3501_reset(dev);
> - spin_unlock_irqrestore(&this->lock, flags);
> if (rc)
> printk(KERN_ERR "%s: Error %d resetting card on Tx timeout!\n",
> dev->name, rc);
>
--
Vaishali
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