scsi: megaraid_sas: Check valid aen class range to avoid kernel panic

commit 91b3d9f0069c8307d0b3a4c6843b65a439183318 upstream.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 17c440b..42ddc4d 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -5094,6 +5094,14 @@ megasas_register_aen(struct megasas_instance *instance, u32 seq_num,
                prev_aen.word =
                        le32_to_cpu(instance->aen_cmd->frame->dcmd.mbox.w[1]);
 
+               if ((curr_aen.members.class < MFI_EVT_CLASS_DEBUG) ||
+                   (curr_aen.members.class > MFI_EVT_CLASS_DEAD)) {
+                       dev_info(&instance->pdev->dev,
+                                "%s %d out of range class %d send by application\n",
+                                __func__, __LINE__, curr_aen.members.class);
+                       return 0;
+               }
+
                /*
                 * A class whose enum value is smaller is inclusive of all
                 * higher values. If a PROGRESS (= -1) was previously