linux-kernel - [RFC 0/2] megaraid: fix illegal pointer dereference in complete_cmd

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Message-ID: <20260125121842.79839-1-pilgrimtao@gmail.com>
Date: Sun, 25 Jan 2026 20:18:40 +0800
From: chengkaitao <pilgrimtao@...il.com>
To: kashyap.desai@...adcom.com,
	sumit.saxena@...adcom.com,
	shivasharan.srikanteshwara@...adcom.com,
	chandrakanth.patil@...adcom.com,
	James.Bottomley@...senPartnership.com,
	martin.petersen@...cle.com
Cc: megaraidlinux.pdl@...adcom.com,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chengkaitao <chengkaitao@...inos.cn>
Subject: [RFC 0/2] megaraid: fix illegal pointer dereference in complete_cmd_fusion

From: Chengkaitao <chengkaitao@...inos.cn>

We have encountered several instances of null pointer dereferences
in the complete_cmd_fusion function. The root cause was consistently
the reply_desc->SMID being erroneously set to 0xffff, resulting in
an invalid cmd_fusion pointer retrieval.

After code review, I suspect synchronization issues in complete_cmd-
_fusion. However, due to the low reproducibility rate of this problem,
I could not perform effective validation. I propose the patch for
kernel community discussion to explore better solutions.

Chengkaitao (2):
  megaraid: Fix the issue of erroneous reset of Words in reply_desc
  megaraid: replacing fusion->busy_mq_poll[*] with irq_context->in_used
    in megasas_blk_mq_poll

 drivers/scsi/megaraid/megaraid_sas_fusion.c | 18 ++++++++++--------
 drivers/scsi/megaraid/megaraid_sas_fusion.h |  2 --
 2 files changed, 10 insertions(+), 10 deletions(-)

-- 
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