linux-kernel - Re: [PATCH v6] mm/slub: avoid accessing metadata when pointer is invalid in object

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Message-ID: <aJH4uT0DwryhE3im@casper.infradead.org>
Date: Tue, 5 Aug 2025 13:27:37 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Li Qiong <liqiong@...china.com>, Christoph Lameter <cl@...two.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Harry Yoo <harry.yoo@...cle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v6] mm/slub: avoid accessing metadata when pointer is
 invalid in object_err()

On Mon, Aug 04, 2025 at 05:19:59PM +0200, Vlastimil Babka wrote:
> On 8/4/25 04:57, Li Qiong wrote:
> > object_err() reports details of an object for further debugging, such as
> > the freelist pointer, redzone, etc. However, if the pointer is invalid,
> > attempting to access object metadata can lead to a crash since it does
> > not point to a valid object.
> > 
> > In case the pointer is NULL or check_valid_pointer() returns false for
> > the pointer, only print the pointer value and skip accessing metadata.

You realy need to get the nfschina mail system fixed.  None of your
messages are making it through to linux-mm.  Either that or start
sending emails from a different provider.

> > Fixes: 81819f0fc828 ("SLUB core")
> > Cc: <stable@...r.kernel.org>
> > Signed-off-by: Li Qiong <liqiong@...china.com>

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>