The commit c1af985d27da ("scsi: mpi3mr: Add Event acknowledgment logic")
introduced an array mrioc->evtack_cmds. But initialization of the array
elements was missed. They are just zero cleared. The function
mpi3mr_complete_evt_ack refers host_tag field of the elements. Due to
zero value of the host_tag field, the functions calls clear_bit for
mrico->evtack_cmds_bitmap with wrong bit index. This results in memory
access to invalid address and "BUG: KASAN: use-after-free". This BUG was
observed at eHBA-9600 firmware update to version 8.3.1.0. To fix it, add
the missing initialization of mrioc->evtack_cmds.
Fixes: c1af985d27da ("scsi: mpi3mr: Add Event acknowledgment logic")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
---
drivers/scsi/mpi3mr/mpi3mr_os.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 3306de7170f6..6eaeba41072c 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -4952,6 +4952,10 @@ mpi3mr_probe(struct pci_dev *pdev, const struct pci_device_id *id)
mpi3mr_init_drv_cmd(&mrioc->dev_rmhs_cmds[i],
MPI3MR_HOSTTAG_DEVRMCMD_MIN + i);
+ for (i = 0; i < MPI3MR_NUM_EVTACKCMD; i++)
+ mpi3mr_init_drv_cmd(&mrioc->evtack_cmds[i],
+ MPI3MR_HOSTTAG_EVTACKCMD_MIN + i);
+
if (pdev->revision)
mrioc->enable_segqueue = true;
--
2.37.1
