linux-kernel - Re: [PATCH -next] livepatch: Fix missing unlock on error in klp_enable

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Message-ID: <YcnqcXMQ7hxBe68a@dev0025.ash9.facebook.com>
Date:   Mon, 27 Dec 2021 08:31:45 -0800
From:   David Vernet <void@...ifault.com>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        jpoimboe@...hat.com, jikos@...nel.org, mbenes@...e.cz,
        pmladek@...e.com
Subject: Re: [PATCH -next] livepatch: Fix missing unlock on error in
 klp_enable_patch()

Yang Yingliang <yangyingliang@...wei.com> wrote on Sat [2021-Dec-25 10:51:15 +0800]:
> Add missing unlock when try_module_get() fails in klp_enable_patch().
> 
> Fixes: bf01c2975925 ("livepatch: Fix kobject refcount bug on klp_init_patch_early failure path")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  kernel/livepatch/core.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index 23cf444091a8..01bfab7fe7c0 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -1047,8 +1047,10 @@ int klp_enable_patch(struct klp_patch *patch)
>  		return -EINVAL;
>  	}
>  
> -	if (!try_module_get(patch->mod))
> +	if (!try_module_get(patch->mod)) {
> +		mutex_unlock(&klp_mutex);
>  		return -ENODEV;
> +	}
>  
>  	klp_init_patch_early(patch);
>  
> -- 
> 2.25.1
> 

Apologies for the silly oversight. Thank you for the fix.

Acked-by: David Vernet <void@...ifault.com>