linux-kernel - Re: [PATCH 130/190] Revert "ALSA: usx2y: Fix potential NULL pointer dereference"

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Date:   Wed, 21 Apr 2021 18:23:19 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Aditya Pakki <pakki001@....edu>
Subject: Re: [PATCH 130/190] Revert "ALSA: usx2y: Fix potential NULL pointer dereference"

On Wed, 21 Apr 2021 15:00:05 +0200,
Greg Kroah-Hartman wrote:
> 
> This reverts commit a2c6433ee5a35a8de6d563f6512a26f87835ea0f.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Aditya Pakki <pakki001@....edu>
> Cc: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This is same like the revert#80, the code change itself seems correct,
but it's a pretty minor error path, probably no one would hit.
So, feel free to revert if it's in doubt.


thanks,

Takashi

> ---
>  sound/usb/usx2y/usb_stream.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
> index 091c071b270a..6bba17bf689a 100644
> --- a/sound/usb/usx2y/usb_stream.c
> +++ b/sound/usb/usx2y/usb_stream.c
> @@ -91,12 +91,7 @@ static int init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
>  
>  	for (u = 0; u < USB_STREAM_NURBS; ++u) {
>  		sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
> -		if (!sk->inurb[u])
> -			return -ENOMEM;
> -
>  		sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
> -		if (!sk->outurb[u])
> -			return -ENOMEM;
>  	}
>  
>  	if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) ||
> -- 
> 2.31.1
>