linux-kernel - Re: [PATCH -next] mm/mmap: fix error return code in do_mas_align

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Date:   Thu, 23 Jun 2022 14:24:27 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Yang Yingliang <yangyingliang@...wei.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "quic_qiancai@...cinc.com" <quic_qiancai@...cinc.com>,
        "yuzhao@...gle.com" <yuzhao@...gle.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH -next] mm/mmap: fix error return code in
 do_mas_align_munmap()


I actually have the same patch sitting on my branch, reported by Dan.  I
have been testing this code before sending it out.

Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>

* Yang Yingliang <yangyingliang@...wei.com> [220623 09:32]:
> Return error code when munmap_sidetree() fails in do_mas_align_munmap().
> 
> Fixes: 81f5504dfb36 ("mm/mmap: change do_mas_align_munmap() to avoid preallocations for sidetree")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  mm/mmap.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/mmap.c b/mm/mmap.c
> index 1bdf56804048..bb978061a790 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2427,7 +2427,8 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
>  
>  			mas_set(mas, end);
>  			split = mas_prev(mas, 0);
> -			if (munmap_sidetree(split, &mas_detach))
> +			error = munmap_sidetree(split, &mas_detach);
> +			if (error)
>  				goto munmap_sidetree_failed;
>  
>  			count++;
> @@ -2435,7 +2436,8 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
>  				vma = split;
>  			break;
>  		}
> -		if (munmap_sidetree(next, &mas_detach))
> +		error = munmap_sidetree(next, &mas_detach);
> +		if (error)
>  			goto munmap_sidetree_failed;
>  
>  		count++;
> -- 
> 2.25.1
>