linux-kernel - Re: [PATCH v1 1/1] mm: Reversed logic in memblock

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Date:   Thu, 24 Aug 2017 14:21:07 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mhocko@...nel.org, akpm@...ux-foundation.org,
        terraluna977@...il.com, stable <stable@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] mm: Reversed logic in memblock_discard

+CC stable

On 08/23/2017 08:04 PM, Pavel Tatashin wrote:
> In recently introduced memblock_discard() there is a reversed logic bug.
> Memory is freed of static array instead of dynamically allocated one.
> 
> Fixes: 3010f876500f ("mm: discard memblock data later")

That patch was CC'd stable. So this one should be too. Looks like it the
original patch wasn't yet included in a stable release, so we can avoid
breakage.

> Reported-and-tested-by: Woody Suwalski <terraluna977@...il.com>
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
> ---
>  mm/memblock.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memblock.c b/mm/memblock.c
> index bf14aea6ab70..91205780e6b1 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -299,7 +299,7 @@ void __init memblock_discard(void)
>  		__memblock_free_late(addr, size);
>  	}
>  
> -	if (memblock.memory.regions == memblock_memory_init_regions) {
> +	if (memblock.memory.regions != memblock_memory_init_regions) {
>  		addr = __pa(memblock.memory.regions);
>  		size = PAGE_ALIGN(sizeof(struct memblock_region) *
>  				  memblock.memory.max);
>