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Petersen" , Shin'ichiro Kawasaki Subject: [PATCH] scsi: mpi3mr: Avoid memcpy field-spanning write WARNING Date: Thu, 7 Mar 2024 13:26:45 +0900 Message-ID: <20240307042645.2827201-1-shinichiro.kawasaki@wdc.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When the "storcli2 show" command is executed for eHBA-9600, mpi3mr driver prints this WARNING: 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] This is caused by the 128 bytes memcpy to the 1 byte size struct field replay_buf in the struct mpi3mr_bsg_in_reply_buf. The field is intended to be a variable length buffer, then the WARN is a false positive. One approach to suppress the WARN is to remove the constant '1' from the replay_buf array declaration to clarify the array size is variable. However, the array is defined in include/uapi/scsi/scsi_bsg_mpi3mr.h and the change will break UAPI compatibility. As another approach, divide the memcpy call into two memcpy calls: one call for the 1 byte size of the array declaration, and the other call for the left over. While at it, replace the magic number 1 with sizeof(bsg_reply_buf->reply_buf); Signed-off-by: Shin'ichiro Kawasaki Reviewed-by: Johannes Thumshirn --- drivers/scsi/mpi3mr/mpi3mr_app.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c index 0380996b5ad2..7fa0710c7574 100644 --- a/drivers/scsi/mpi3mr/mpi3mr_app.c +++ b/drivers/scsi/mpi3mr/mpi3mr_app.c @@ -1233,6 +1233,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job) u8 *din_buf = NULL, *dout_buf = NULL; u8 *sgl_iter = NULL, *sgl_din_iter = NULL, *sgl_dout_iter = NULL; u16 rmc_size = 0, desc_count = 0; + int declared_size; bsg_req = job->request; karg = (struct mpi3mr_bsg_mptcmd *)&bsg_req->cmd.mptcmd; @@ -1643,9 +1644,11 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job) if ((mpirep_offset != 0xFF) && drv_bufs[mpirep_offset].bsg_buf_len) { + declared_size = sizeof(bsg_reply_buf->reply_buf); drv_buf_iter = &drv_bufs[mpirep_offset]; - drv_buf_iter->kern_buf_len = (sizeof(*bsg_reply_buf) - 1 + - mrioc->reply_sz); + drv_buf_iter->kern_buf_len = (sizeof(*bsg_reply_buf) + - declared_size + + mrioc->reply_sz); bsg_reply_buf = kzalloc(drv_buf_iter->kern_buf_len, GFP_KERNEL); if (!bsg_reply_buf) { @@ -1655,8 +1658,13 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job) if (mrioc->bsg_cmds.state & MPI3MR_CMD_REPLY_VALID) { bsg_reply_buf->mpi_reply_type = MPI3MR_BSG_MPI_REPLY_BUFTYPE_ADDRESS; + /* Divide memcpy to avoid field-spanning write WARN */ memcpy(bsg_reply_buf->reply_buf, - mrioc->bsg_cmds.reply, mrioc->reply_sz); + mrioc->bsg_cmds.reply, + declared_size); + memcpy(bsg_reply_buf->reply_buf + declared_size, + (u8 *)mrioc->bsg_cmds.reply + declared_size, + mrioc->reply_sz - declared_size); } else { bsg_reply_buf->mpi_reply_type = MPI3MR_BSG_MPI_REPLY_BUFTYPE_STATUS;