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Sat, 31 Jan 2026 19:31:18 -0800 (PST) Received: from localhost.localdomain ([113.218.252.120]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379b6b2bdsm11831817b3a.30.2026.01.31.19.31.13 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 31 Jan 2026 19:31:16 -0800 (PST) From: chengkaitao To: kashyap.desai@broadcom.com, sumit.saxena@broadcom.com, shivasharan.srikanteshwara@broadcom.com, chandrakanth.patil@broadcom.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com Cc: megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Chengkaitao Subject: [RFC RESEND 0/2] megaraid: fix illegal pointer dereference in complete_cmd_fusion Date: Sun, 1 Feb 2026 11:31:08 +0800 Message-ID: <20260201033110.34297-1-pilgrimtao@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chengkaitao 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(-) -- 2.50.1 (Apple Git-155)