linux-kernel - Re: [PATCH V4 2/2] ocfs2: Fix possible null-ptr-deref in ocfs2_set_buffer

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Message-ID: <b1e6e5af-696c-4bfb-a233-7a0821246ce4@linux.alibaba.com>
Date: Wed, 21 Aug 2024 15:59:20 +0800
From: Joseph Qi <joseph.qi@...ux.alibaba.com>
To: Lizhi Xu <lizhi.xu@...driver.com>, akpm <akpm@...ux-foundation.org>
Cc: heming.zhao@...e.com, jlbec@...lplan.org, linux-kernel@...r.kernel.org,
 mark@...heh.com, ocfs2-devel@...ts.linux.dev,
 syzbot+ab134185af9ef88dfed5@...kaller.appspotmail.com,
 syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH V4 2/2] ocfs2: Fix possible null-ptr-deref in
 ocfs2_set_buffer_uptodate



On 8/21/24 2:14 PM, Lizhi Xu wrote:
> When doing cleanup, if flags without OCFS2_BH_READAHEAD, it may trigger
> NULL pointer dereference in the following ocfs2_set_buffer_uptodate() if
> bh is NULL.
> 
> Reported-and-suggested-by: Heming Zhao <heming.zhao@...e.com>
> Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>

Reviewed-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
> ---
> V3 -> V4: Update comments and subject
> 
>  fs/ocfs2/buffer_head_io.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
> index e62c7e1de4eb..8f714406528d 100644
> --- a/fs/ocfs2/buffer_head_io.c
> +++ b/fs/ocfs2/buffer_head_io.c
> @@ -388,7 +388,8 @@ int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
>  		/* Always set the buffer in the cache, even if it was
>  		 * a forced read, or read-ahead which hasn't yet
>  		 * completed. */
> -		ocfs2_set_buffer_uptodate(ci, bh);
> +		if (bh)
> +			ocfs2_set_buffer_uptodate(ci, bh);
>  	}
>  	ocfs2_metadata_cache_io_unlock(ci);
>