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Date:   Fri, 28 May 2021 11:13:36 -0700
From:   Kees Cook <>
To:     "Martin K . Petersen" <>
Cc:     Kees Cook <>, Hannes Reinecke <>,
        "James E.J. Bottomley" <>,
        "Gustavo A. R. Silva" <>,
        Bradley Grove <>,
        Artur Paszkiewicz <>,,,
Subject: [PATCH 2/3] scsi: esas2r: Switch to flexible array member

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), avoid intentionally writing across
neighboring array fields.

Remove old-style 1-byte array in favor of a flexible array[1] to avoid
future false-positive cross-field memcpy() warning in:

	memcpy(vi->cmd.gsv.version_info, esas2r_vdaioctl_versions, ...)

The change in struct size doesn't change other structure sizes (it is
already maxed out to 256 bytes, for example here:

        union {
                struct atto_ioctl_vda_scsi_cmd scsi;
                struct atto_ioctl_vda_flash_cmd flash;
                struct atto_ioctl_vda_diag_cmd diag;
                struct atto_ioctl_vda_cli_cmd cli;
                struct atto_ioctl_vda_smp_cmd smp;
                struct atto_ioctl_vda_cfg_cmd cfg;
                struct atto_ioctl_vda_mgt_cmd mgt;
                struct atto_ioctl_vda_gsv_cmd gsv;
                u8 cmd_info[256];
        } cmd;

No sizes are calculated using the enclosing structure, so no other
updates are needed.

Signed-off-by: Kees Cook <>
 drivers/scsi/esas2r/atioctl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/esas2r/atioctl.h b/drivers/scsi/esas2r/atioctl.h
index 4aca3d52c851..ff2ad9b38575 100644
--- a/drivers/scsi/esas2r/atioctl.h
+++ b/drivers/scsi/esas2r/atioctl.h
@@ -1141,7 +1141,7 @@ struct __packed atto_ioctl_vda_gsv_cmd {
 	u8 rsp_len;
 	u8 reserved[7];
-	u8 version_info[1];
+	u8 version_info[];

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