linux-kernel - Re: [PATCH] clk: socfpga: Fix a memory leak bug in socfpga_gate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220124195341.50C97C340E5@smtp.kernel.org>
Date:   Mon, 24 Jan 2022 11:53:39 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     zhou1615@....edu
Cc:     kjlu@....edu, Dinh Nguyen <dinguyen@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: socfpga: Fix a memory leak bug in socfpga_gate_init()

Quoting Zhou Qingyang (2022-01-24 08:53:16)
> diff --git a/drivers/clk/socfpga/clk-gate.c b/drivers/clk/socfpga/clk-gate.c
> index 53d6e3ec4309..0ca5e0000925 100644
> --- a/drivers/clk/socfpga/clk-gate.c
> +++ b/drivers/clk/socfpga/clk-gate.c
> @@ -188,8 +188,10 @@ void __init socfpga_gate_init(struct device_node *node)
>                 return;
>  
>         ops = kmemdup(&gateclk_ops, sizeof(gateclk_ops), GFP_KERNEL);
> -       if (WARN_ON(!ops))
> +       if (WARN_ON(!ops)) {

A WARN_ON() after an allocation failure will lead to double stacktraces.
Can you remove the WARN_ON()?

Furthermore, it looks like 'ops' is never freed on failure in this
function. Did the SA tool figure that out? There are more problems with
this function and error paths. Seems like nobody cares.

> +               kfree(socfpga_clk);
>                 return;
> +       }
>