linux-kernel - [PATCH] scsi: mpi3mr: Replace 1-element array with flex-array

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Date:   Sat,  4 Feb 2023 10:37:16 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Sumit Saxena <sumit.saxena@...adcom.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        kernel test robot <lkp@...el.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] scsi: mpi3mr: Replace 1-element array with flex-array

Nothing else defined MPI3_NVME_ENCAP_CMD_MAX, so the "command"
buffer was being defined as a fake flexible array of size 1. Replace
this with a proper flex array. Avoids this GCC 13 warning under
-fstrict-flex-arrays=3:

In function 'fortify_memset_chk',
    inlined from 'mpi3mr_build_nvme_sgl' at ../drivers/scsi/mpi3mr/mpi3mr_app.c:693:2,
    inlined from 'mpi3mr_bsg_process_mpt_cmds.constprop' at ../drivers/scsi/mpi3mr/mpi3mr_app.c:1214:8:
../include/linux/fortify-string.h:430:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()?  [-Wattribute-warning]
  430 |                         __write_overflow_field(p_size_field, size);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cc: Sumit Saxena <sumit.saxena@...adcom.com>
Cc: Himanshu Madhani <himanshu.madhani@...cle.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: kernel test robot <lkp@...el.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/uapi/scsi/scsi_bsg_mpi3mr.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/uapi/scsi/scsi_bsg_mpi3mr.h b/include/uapi/scsi/scsi_bsg_mpi3mr.h
index fdc3517f9e19..907d345f04f9 100644
--- a/include/uapi/scsi/scsi_bsg_mpi3mr.h
+++ b/include/uapi/scsi/scsi_bsg_mpi3mr.h
@@ -455,12 +455,6 @@ struct mpi3mr_bsg_packet {
 	} cmd;
 };
 
-
-/* MPI3: NVMe Encasulation related definitions */
-#ifndef MPI3_NVME_ENCAP_CMD_MAX
-#define MPI3_NVME_ENCAP_CMD_MAX               (1)
-#endif
-
 struct mpi3_nvme_encapsulated_request {
 	__le16	host_tag;
 	__u8	ioc_use_only02;
@@ -474,7 +468,7 @@ struct mpi3_nvme_encapsulated_request {
 	__le16	flags;
 	__le32	data_length;
 	__le32  reserved14[3];
-	__le32	command[MPI3_NVME_ENCAP_CMD_MAX];
+	__le32	command[];
 };
 
 struct mpi3_nvme_encapsulated_error_reply {
-- 
2.34.1