linux-kernel - Re: [PATCH v2 1/2] cxl/cdat: Handle cdat table build errors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 19 Dec 2023 09:44:06 -0800
From: fan <nifan.cxl@...il.com>
To: Ira Weiny <ira.weiny@...el.com>
Cc: Jonathan Cameron <jonathan.cameron@...wei.com>,
	Fan Ni <nifan.cxl@...il.com>, Dave Jiang <dave.jiang@...el.com>,
	linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
	Huai-Cheng Kuo <hchkuo@...ry-design.com.tw>
Subject: Re: [PATCH v2 1/2] cxl/cdat: Handle cdat table build errors

On Wed, Nov 29, 2023 at 05:33:03PM -0800, Ira Weiny wrote:
> The callback for building CDAT tables may return negative error codes.
> This was previously unhandled and will result in potentially huge
> allocations later on in ct3_build_cdat()
> 
> Detect the negative error code and defer cdat building.
> 
> Fixes: f5ee7413d592 ("hw/mem/cxl-type3: Add CXL CDAT Data Object Exchange")
> Cc: Huai-Cheng Kuo <hchkuo@...ry-design.com.tw>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
>  hw/cxl/cxl-cdat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/cxl/cxl-cdat.c b/hw/cxl/cxl-cdat.c
> index 639a2db3e17b..24829cf2428d 100644
> --- a/hw/cxl/cxl-cdat.c
> +++ b/hw/cxl/cxl-cdat.c
> @@ -63,7 +63,7 @@ static void ct3_build_cdat(CDATObject *cdat, Error **errp)
>      cdat->built_buf_len = cdat->build_cdat_table(&cdat->built_buf,
>                                                   cdat->private);
>  
> -    if (!cdat->built_buf_len) {
> +    if (cdat->built_buf_len <= 0) {
>          /* Build later as not all data available yet */
>          cdat->to_update = true;
>          return;
> 

The fix looks good to me. Just curious how to really build cdat table
again when an error occurs, for example, the memory allocation fails.

Fan
> -- 
> 2.42.0
>