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Host drivers do not necessarily set cdb_len in megasas io commands. With commits6d1511cea0("scsi: Reject commands if the CDB length exceeds buf_len") andfe9d8927e2("scsi: Add buf_len parameter to scsi_req_new()"), this results in failures to boot Linux from affected SCSI drives because cdb_len is set to 0 by the host driver. Set the cdb length to its actual size to solve the problem. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Fabiano Rosas <farosas@suse.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Tested-by: Fiona Ebner <f.ebner@proxmox.com> Link: https://lore.kernel.org/r/20230228171129.4094709-1-linux@roeck-us.net Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>