[PATCH] media: rc: iguanair: handle timeouts

[PATCH] media: rc: iguanair: handle timeouts

[Oliver Neukum]

In case of a timeout the IO must be cancelled or
the next IO using the URB will fail and/or overwrite
an operational URB.

The automatic bisection fails because it arrives
at a commit that correctly lets the test case run
without an error.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Fixes: e99a7cfe93fd9  ("[media] iguanair: reuse existing urb callback for command responses")
Reported-by: syzbot+ffba8e636870dac0e0c0@syzkaller.appspotmail.com
Tested-by: syzbot+ffba8e636870dac0e0c0@syzkaller.appspotmail.com
---
 drivers/media/rc/iguanair.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
index 276bf3c8a8cb..8af94246e591 100644
--- a/drivers/media/rc/iguanair.c
+++ b/drivers/media/rc/iguanair.c
@@ -194,8 +194,10 @@ static int iguanair_send(struct iguanair *ir, unsigned size)
 	if (rc)
 		return rc;
 
-	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
+	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0) {
+		usb_kill_urb(ir->urb_out);
 		return -ETIMEDOUT;
+	}
 
 	return rc;
 }
-- 
2.47.0

Re: [PATCH] media: rc: iguanair: handle timeouts

[Greg KH]

On Tue, Nov 26, 2024 at 02:17:22PM +0100, Oliver Neukum wrote:
> In case of a timeout the IO must be cancelled or
> the next IO using the URB will fail and/or overwrite
> an operational URB.
> 
> The automatic bisection fails because it arrives
> at a commit that correctly lets the test case run
> without an error.
> 
> Signed-off-by: Oliver Neukum <oneukum@suse.com>
> Fixes: e99a7cfe93fd9  ("[media] iguanair: reuse existing urb callback for command responses")
> Reported-by: syzbot+ffba8e636870dac0e0c0@syzkaller.appspotmail.com
> Tested-by: syzbot+ffba8e636870dac0e0c0@syzkaller.appspotmail.com
> ---
>  drivers/media/rc/iguanair.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
> index 276bf3c8a8cb..8af94246e591 100644
> --- a/drivers/media/rc/iguanair.c
> +++ b/drivers/media/rc/iguanair.c
> @@ -194,8 +194,10 @@ static int iguanair_send(struct iguanair *ir, unsigned size)
>  	if (rc)
>  		return rc;
>  
> -	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
> +	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0) {
> +		usb_kill_urb(ir->urb_out);
>  		return -ETIMEDOUT;
> +	}
>  
>  	return rc;
>  }
> -- 
> 2.47.0
> 
> 

Hi,

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