Re: [PATCH] net: qrtr: Fix memory leak on qrtr_tx_wait failure

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Tue 30 Mar 09:11 CDT 2021, Loic Poulain wrote:

> qrtr_tx_wait does not check for radix_tree_insert failure, causing
> the 'flow' object to be unreferenced after qrtr_tx_wait return. Fix
> that by releasing flow on radix_tree_insert failure.
> 
> Fixes: 5fdeb0d372ab ("net: qrtr: Implement outgoing flow control")
> Reported-by: syzbot+739016799a89c530b32a@syzkaller.appspotmail.com
> Signed-off-by: Loic Poulain <loic.poulain@linaro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> ---
>  net/qrtr/qrtr.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
> index f4ab3ca6..a01b50c7 100644
> --- a/net/qrtr/qrtr.c
> +++ b/net/qrtr/qrtr.c
> @@ -271,7 +271,10 @@ static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
>  		flow = kzalloc(sizeof(*flow), GFP_KERNEL);
>  		if (flow) {
>  			init_waitqueue_head(&flow->resume_tx);
> -			radix_tree_insert(&node->qrtr_tx_flow, key, flow);
> +			if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
> +				kfree(flow);
> +				flow = NULL;
> +			}
>  		}
>  	}
>  	mutex_unlock(&node->qrtr_tx_lock);
> -- 
> 2.7.4
>