linux-kernel - Re: [PATCH v2 2/5] scsi: fnic: Fix crash in fnic_wq_cmpl

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Message-ID: <f4ec4c04-6f41-4886-a7c0-da8334bd4745@suse.de>
Date: Tue, 8 Jul 2025 11:03:03 +0200
From: Hannes Reinecke <hare@...e.de>
To: Karan Tilak Kumar <kartilak@...co.com>, sebaddel@...co.com
Cc: arulponn@...co.com, djhawar@...co.com, gcboffa@...co.com,
 mkai2@...co.com, satishkh@...co.com, aeasi@...co.com, jejb@...ux.ibm.com,
 martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org, jmeneghi@...hat.com, revers@...hat.com,
 dan.carpenter@...aro.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 2/5] scsi: fnic: Fix crash in fnic_wq_cmpl_handler when
 FDMI times out

On 6/12/25 02:22, Karan Tilak Kumar wrote:
> When both the RHBA and RPA FDMI requests time out, fnic reuses a frame
> to send ABTS for each of them. On send completion, this causes an
> attempt to free the same frame twice that leads to a crash.
> 
> Fix crash by allocating separate frames for RHBA and RPA,
> and modify ABTS logic accordingly.
> 
> Tested by checking MDS for FDMI information.
> Tested by using instrumented driver to:
> Drop PLOGI response
> Drop RHBA response
> Drop RPA response
> Drop RHBA and RPA response
> Drop PLOGI response + ABTS response
> Drop RHBA response + ABTS response
> Drop RPA response + ABTS response
> Drop RHBA and RPA response + ABTS response for both of them
> 
> Fixes: 09c1e6ab4ab2 ("scsi: fnic: Add and integrate support for FDMI")
> Reviewed-by: Sesidhar Baddela <sebaddel@...co.com>
> Reviewed-by: Arulprabhu Ponnusamy <arulponn@...co.com>
> Reviewed-by: Gian Carlo Boffa <gcboffa@...co.com>
> Tested-by: Arun Easi <aeasi@...co.com>
> Co-developed-by: Arun Easi <aeasi@...co.com>
> Signed-off-by: Arun Easi <aeasi@...co.com>
> Tested-by: Karan Tilak Kumar <kartilak@...co.com>
> Signed-off-by: Karan Tilak Kumar <kartilak@...co.com>
> ---
>   drivers/scsi/fnic/fdls_disc.c | 113 +++++++++++++++++++++++++---------
>   drivers/scsi/fnic/fnic_fdls.h |   1 +
>   2 files changed, 86 insertions(+), 28 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

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