linux-kernel - Re: [PATCH 1/1] Fix a wrong value passed to __find_vmap

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Message-ID: <20240111155511.GA3451701@dev-arch.thelio-3990X>
Date: Thu, 11 Jan 2024 08:55:11 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Matthew Wilcox <willy@...radead.org>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Dave Chinner <david@...morbit.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 1/1] Fix a wrong value passed to __find_vmap_area()

On Thu, Jan 11, 2024 at 01:11:04PM +0100, Uladzislau Rezki (Sony) wrote:
> There was a type in the vmalloc_dump_obj() function. Instead
> of passing a real address which is "objp" an "addr" was used
> what is wrong and not initialized.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: e88b85b81d5 ("mm: vmalloc: offload free_vmap_area_lock lock")

I am not sure that e88b85b81d5 introduced this. Based on the diff, I
think it was actually commit 86817057732a ("mm: vmalloc: remove global
vmap_area_root rb-tree"). Does not really matter for the patch text but
I think it does matter for what change this gets squashed into.

> Closes: https://lore.kernel.org/oe-kbuild-all/202401111810.TKPIXLCs-lkp@intel.com/
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  mm/vmalloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index e30dabf68263..43a6608e1397 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -4688,7 +4688,7 @@ bool vmalloc_dump_obj(void *object)
>  	vn = addr_to_node((unsigned long)objp);
>  
>  	if (spin_trylock(&vn->busy.lock)) {
> -		va = __find_vmap_area(addr, &vn->busy.root);
> +		va = __find_vmap_area((unsigned long)objp, &vn->busy.root);
>  
>  		if (va && va->vm) {
>  			addr = (unsigned long)va->vm->addr;
> -- 
> 2.39.2
>