[PATCH AUTOSEL 6.1 09/13] scsi: mpi3mr: Avoid memcpy field-spanning write WARNING

Sasha Levin
2024-04-07T13:13:32Z

From: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>

[ Upstream commit 429846b4b6ce9853e0d803a2357bb2e55083adf0 ]

When the "storcli2 show" command is executed for eHBA-9600, mpi3mr driver
prints this WARNING message:

memcpy: detected field-spanning write (size 128) of single field "bsg_reply_buf->reply_buf" at drivers/scsi/mpi3mr/mpi3mr_app.c:1658 (size 1)
WARNING: CPU: 0 PID: 12760 at drivers/scsi/mpi3mr/mpi3mr_app.c:1658 mpi3mr_bsg_request+0x6b12/0x7f10 [mpi3mr]

The cause of the WARN is 128 bytes memcpy to the 1 byte size array "__u8
replay_buf[1]" in the struct mpi3mr_bsg_in_reply_buf. The array is intended
to be a flexible length array, so the WARN is a false positive.

To suppress the WARN, remove the constant number '1' from the array
declaration and clarify that it has flexible length. Also, adjust the
memory allocation size to match the change.

Suggested-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Link: https://lore.kernel.org/r/20240323084155.166835-1-shinichiro.kawasaki@wdc.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/mpi3mr/mpi3mr_app.c | 2 +-
include/uapi/scsi/scsi_bsg_mpi3mr.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
index 8c662d08706f1..42600e5c457a1 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_app.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
@@ -1344,7 +1344,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
if ((mpirep_offset != 0xFF) &&
drv_bufs[mpirep_offset].bsg_buf_len) {
drv_buf_iter = &drv_bufs[mpirep_offset];
- drv_buf_iter->kern_buf_len = (sizeof(*bsg_reply_buf) - 1 +
+ drv_buf_iter->kern_buf_len = (sizeof(*bsg_reply_buf) +
mrioc->reply_sz);
bsg_reply_buf = kzalloc(drv_buf_iter->kern_buf_len, GFP_KERNEL);

diff --git a/include/uapi/scsi/scsi_bsg_mpi3mr.h b/include/uapi/scsi/scsi_bsg_mpi3mr.h
index fdc3517f9e199..c48c5d08c0fa0 100644
--- a/include/uapi/scsi/scsi_bsg_mpi3mr.h
+++ b/include/uapi/scsi/scsi_bsg_mpi3mr.h
@@ -382,7 +382,7 @@ struct mpi3mr_bsg_in_reply_buf {
__u8 mpi_reply_type;
__u8 rsvd1;
__u16 rsvd2;
- __u8 reply_buf[1];
+ __u8 reply_buf[];
};

/**
--
2.43.0