Merge pull request #942 from sfackler/fix-cms-crash

        flags: CMSOptions,

    ) -> Result<CmsContentInfo, ErrorStack> {

        unsafe {

            let signcert = match signcert {

                Some(cert) => cert.as_ptr(),

                None => ptr::null_mut(),

            };

            let pkey = match pkey {

                Some(pkey) => pkey.as_ptr(),

                None => ptr::null_mut(),

            };

            let data_bio_ptr = match data {

                Some(data) => MemBioSlice::new(data)?.as_ptr(),

                None => ptr::null_mut(),

            };

            let certs = match certs {

                Some(certs) => certs.as_ptr(),

                None => ptr::null_mut(),

            let signcert = signcert.map_or(ptr::null_mut(), |p| p.as_ptr());

            let pkey = pkey.map_or(ptr::null_mut(), |p| p.as_ptr());

            let data_bio = match data {

                Some(data) => Some(MemBioSlice::new(data)?),

                None => None,

            };

            let data_bio_ptr = data_bio.as_ref().map_or(ptr::null_mut(), |p| p.as_ptr());

            let certs = certs.map_or(ptr::null_mut(), |p| p.as_ptr());

            let cms = cvt_p(ffi::CMS_sign(

                signcert,