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([101.6.42.129]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8bed243c34dsm1376800b3a.41.2026.11.13.08.25.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Nov 2026 08:25:45 -0800 (PST) From: Tuo Li To: kashyap.desai@broadcom.com, sumit.saxena@broadcom.com, shivasharan.srikanteshwara@broadcom.com, chandrakanth.patil@broadcom.com, James.Bottomley@HansenPartnership.com, mkp@kernel.org Cc: megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Tuo Li Subject: [PATCH] scsi: megaraid_sas: Fix NULL pointer dereference in megasas_complete_cmd() Date: Sat, 14 Nov 2026 00:25:24 +0800 Message-ID: <20261113162524.162899-1-islituo@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit MFI_CMD_LD_READ and MFI_CMD_LD_WRITE commands can be submitted through the management ioctl interface, where cmd->sync_cmd is set and cmd->scmd is NULL. However, these commands bypass the sync_cmd check in megasas_complete_cmd() due to their placement after the fallthrough statement. As a result, the completion handler may dereference cmd->scmd, leading to a NULL pointer dereference. Move the MFI_CMD_LD_READ and MFI_CMD_LD_WRITE case labels before the sync_cmd check so that synchronous commands are handled by megasas_complete_int_cmd(). Fixes: c4a3e0a529ab ("[SCSI] MegaRAID SAS RAID: new driver") Signed-off-by: Tuo Li --- drivers/scsi/megaraid/megaraid_sas_base.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 602173fd313a..5e1aeec96a4d 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -3635,6 +3635,8 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd, break; case MFI_CMD_PD_SCSI_IO: case MFI_CMD_LD_SCSI_IO: + case MFI_CMD_LD_READ: + case MFI_CMD_LD_WRITE: /* * MFI_CMD_PD_SCSI_IO and MFI_CMD_LD_SCSI_IO could have been @@ -3646,10 +3648,6 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd, megasas_complete_int_cmd(instance, cmd); break; } - fallthrough; - - case MFI_CMD_LD_READ: - case MFI_CMD_LD_WRITE: if (alt_status) { cmd->scmd->result = alt_status << 16; -- 2.43.0