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Re: [PATCH 2/6] block/mirror: fix use after free of local_err


From: John Snow
Subject: Re: [PATCH 2/6] block/mirror: fix use after free of local_err
Date: Tue, 24 Mar 2020 13:10:40 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1


On 3/24/20 11:36 AM, Vladimir Sementsov-Ogievskiy wrote:
> local_err is used again in mirror_exit_common() after
> bdrv_set_backing_hd(), so we must zero it. Otherwise try to set
> non-NULL local_err will crash.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> ---
>  block/mirror.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/block/mirror.c b/block/mirror.c
> index 447051dbc6..6203e5946e 100644
> --- a/block/mirror.c
> +++ b/block/mirror.c
> @@ -678,6 +678,7 @@ static int mirror_exit_common(Job *job)
>              bdrv_set_backing_hd(target_bs, backing, &local_err);
>              if (local_err) {
>                  error_report_err(local_err);
> +                local_err = NULL;
>                  ret = -EPERM;
>              }
>          }
> 

Reviewed-by: John Snow <address@hidden>




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