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From: Manivannan Sadhasivam <mani@kernel.org>
To: Pavel Skripkin <paskripkin@gmail.com>
Cc: davem@davemloft.net, kuba@kernel.org,
	bjorn.andersson@sonymobile.com, courtney.cavin@sonymobile.com,
	linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	syzbot+35a511c72ea7356cdcf3@syzkaller.appspotmail.com
Subject: Re: [PATCH] net: qrtr: fix memory leak in qrtr_local_enqueue
Date: Fri, 23 Jul 2021 17:57:53 +0530	[thread overview]
Message-ID: <20210723122753.GA3739@thinkpad> (raw)
In-Reply-To: <20210722161625.6956-1-paskripkin@gmail.com>

On Thu, Jul 22, 2021 at 07:16:25PM +0300, Pavel Skripkin wrote:
> Syzbot reported memory leak in qrtr. The problem was in unputted
> struct sock. qrtr_local_enqueue() function calls qrtr_port_lookup()
> which takes sock reference if port was found. Then there is the following
> check:
> 
> if (!ipc || &ipc->sk == skb->sk) {
> 	...
> 	return -ENODEV;
> }
> 
> Since we should drop the reference before returning from this function and
> ipc can be non-NULL inside this if, we should add qrtr_port_put() inside
> this if.
> 
> Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
> Reported-and-tested-by: syzbot+35a511c72ea7356cdcf3@syzkaller.appspotmail.com
> Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

It'd be good if this patch can be extended to fix one more corner case here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/qrtr/qrtr.c#n522

Thanks,
Mani

> ---
>  net/qrtr/qrtr.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
> index e6f4a6202f82..d5ce428d0b25 100644
> --- a/net/qrtr/qrtr.c
> +++ b/net/qrtr/qrtr.c
> @@ -839,6 +839,8 @@ static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
>  
>  	ipc = qrtr_port_lookup(to->sq_port);
>  	if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
> +		if (ipc)
> +			qrtr_port_put(ipc);
>  		kfree_skb(skb);
>  		return -ENODEV;
>  	}
> -- 
> 2.32.0
> 

  reply	other threads:[~2021-07-23 12:28 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 16:16 Pavel Skripkin
2021-07-23 12:27 ` Manivannan Sadhasivam [this message]
2021-07-23 15:08   ` Pavel Skripkin
2021-07-23 15:31   ` [PATCH v2] net: qrtr: fix memory leaks Pavel Skripkin
2021-07-23 15:43     ` Manivannan Sadhasivam
2021-07-23 16:50     ` patchwork-bot+netdevbpf

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