linux-kernel - Re: [PATCH] lightnvm: pblk: fix use-after-free bug

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Date:   Sat, 22 Dec 2018 19:30:15 +0100
From:   Matias Bjørling <mb@...htnvm.io>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Igor Konopko <igor.j.konopko@...el.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lightnvm: pblk: fix use-after-free bug

On 12/22/18 8:39 AM, Gustavo A. R. Silva wrote:
> Remove one of the calls to function bio_put(), so *bio* is only
> freed once.
> 
> Notice that bio is being dereferenced in bio_put(), hence leading to
> a use-after-free bug once *bio* has already been freed.
> 
> Addresses-Coverity-ID: 1475952 ("Use after free")
> Fixes: 55d8ec35398e ("lightnvm: pblk: support packed metadata")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>   drivers/lightnvm/pblk-recovery.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
> index 3fcf062d752c..5ee20da7bdb3 100644
> --- a/drivers/lightnvm/pblk-recovery.c
> +++ b/drivers/lightnvm/pblk-recovery.c
> @@ -418,7 +418,6 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
>   	if (ret) {
>   		pblk_err(pblk, "I/O submission failed: %d\n", ret);
>   		bio_put(bio);
> -		bio_put(bio);
>   		return ret;
>   	}
>   
> 

Thanks Gustavo. I missed that one.

Jens, if possible could you please pick this up?

Happy holidays!