linux-kernel - Re: [PATCH v6 14/14] nvme-fc: do not reference lsrsp after failure

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Message-ID: <1ce2a108-1b20-4ad9-ad29-ea4721c938e1@suse.de>
Date: Wed, 7 May 2025 16:00:29 +0200
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <wagi@...nel.org>, James Smart <james.smart@...adcom.com>,
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
 Chaitanya Kulkarni <kch@...dia.com>
Cc: Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 14/14] nvme-fc: do not reference lsrsp after failure

On 5/7/25 14:23, Daniel Wagner wrote:
> The lsrsp object is maintained by the LLDD. The lifetime of the lsrsp
> object is implicit. Because there is no explicit cleanup/free call into
> the LLDD, it is not safe to assume after xml_rsp_fails, that the lsrsp
> is still valid. The LLDD could have freed the object already.
> 
> With the recent changes how fcloop tracks the resources, this is the
> case. Thus don't access lsrsp after xml_rsp_fails.
> 
> Signed-off-by: Daniel Wagner <wagi@...nel.org>
> ---
>   drivers/nvme/host/fc.c | 13 ++++++++++---
>   1 file changed, 10 insertions(+), 3 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...nel.org>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich