From: Kent Overstreet <kent.overstreet@linux.dev>
To: Youling Tang <youling.tang@linux.dev>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Youling Tang <tangyouling@kylinos.cn>
Subject: Re: [PATCH] mm: list_lru: Fix NULL pointer dereference in list_lru_add()
Date: Fri, 12 Jul 2024 00:07:32 -0400 [thread overview]
Message-ID: <sd32qchit33aafht27utinrz5dizw62qbtwdmwbtugqrlglmtx@6aitsotgqnpi> (raw)
In-Reply-To: <20240712032554.444823-1-youling.tang@linux.dev>
On Fri, Jul 12, 2024 at 11:25:54AM GMT, Youling Tang wrote:
> From: Youling Tang <tangyouling@kylinos.cn>
>
> Note that list_lru_from_memcg_idx() may return NULL, so it is necessary
> to error handle the return value to avoid triggering NULL pointer
> dereference BUG.
>
> The issue was triggered for discussion [1],
> Link [1]: https://lore.kernel.org/linux-bcachefs/84de6cb1-57bd-42f7-8029-4203820ef0b4@linux.dev/T/#m901bb26cdb1d9d4bacebf0d034f0a5a712cc93a6
I see no explanation for why this is the correct fix, and I doubt it is.
What's the real reason for the NULL lru_list_one, and why doesn't this
come up on other filesystems?
next prev parent reply other threads:[~2024-07-12 4:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-12 3:25 Youling Tang
2024-07-12 4:07 ` Kent Overstreet [this message]
2024-07-12 4:28 ` Youling Tang
2024-07-12 15:49 ` Kent Overstreet
2024-07-16 2:28 ` Youling Tang
2024-07-16 2:30 ` Kent Overstreet
2024-07-15 3:27 ` Qi Zheng
2024-07-17 2:25 ` Youling Tang
2024-07-17 2:37 ` Qi Zheng
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