linux-kernel - Re: [PATCH v2] xfs: Fix a memory leak in xfs_buf_item

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Message-ID: <ojskmuuwjgieezp3zrff6ub5ihgr5buk6gtgqrm5gnr2zzcolk@ret4ukkxzcfo>
Date: Thu, 11 Dec 2025 10:18:48 +0100
From: Carlos Maiolino <cem@...nel.org>
To: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
Cc: darrick.wong@...cle.com, linux-xfs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] xfs: Fix a memory leak in xfs_buf_item_init()

On Wed, Dec 10, 2025 at 05:06:01PM +0800, Haoxiang Li wrote:
> xfs_buf_item_get_format() may allocate memory for bip->bli_formats,
> free the memory in the error path.
> 
> Fixes: c3d5f0c2fb85 ("xfs: complain if anyone tries to create a too-large buffer log item")
> Cc: stable@...r.kernel.org
> Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
> Changes in v2:
> - Modify the patch subject. Thanks, Christoph!
> ---
>  fs/xfs/xfs_buf_item.c | 1 +
>  1 file changed, 1 insertion(+)
> 

We have a cosmetic 'rule' to not use an Upper case character for the
subject, I'll fix that during commit time, no need to send it again.

for the patch itself:

Reviewed-by: Carlos Maiolino <cmaiolino@...hat.com>


> diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
> index 8d85b5eee444..f4c5be67826e 100644
> --- a/fs/xfs/xfs_buf_item.c
> +++ b/fs/xfs/xfs_buf_item.c
> @@ -896,6 +896,7 @@ xfs_buf_item_init(
>  		map_size = DIV_ROUND_UP(chunks, NBWORD);
> 
>  		if (map_size > XFS_BLF_DATAMAP_SIZE) {
> +			xfs_buf_item_free_format(bip);
>  			kmem_cache_free(xfs_buf_item_cache, bip);
>  			xfs_err(mp,
>  	"buffer item dirty bitmap (%u uints) too small to reflect %u bytes!",
> --
> 2.25.1
>