crypto: marvell - add support for OCTEON TX CPT engine

Hello SrujanaChalla,

This is a semi-automatic email about new static checker warnings.

The patch d9110b0b01ff: "crypto: marvell - add support for OCTEON TX CPT engine" from Mar 13, 2020, leads to the following Smatch complaint:

drivers/crypto/marvell/octeontx/otx_cptpf_ucode.c:1300 create_engine_group()
error: we previously assumed 'mirrored_eng_grp' could be null (see line 1256)

drivers/crypto/marvell/octeontx/otx_cptpf_ucode.c
1255 mirrored_eng_grp = find_mirrored_eng_grp(eng_grp);

  1256		if (mirrored_eng_grp) {
                    ^^^^^^^^^^^^^^^^

The patch adds a check

1257 /* Setup mirroring */
1258 setup_eng_grp_mirroring(eng_grp, mirrored_eng_grp);
1259
1260 /*
1261 * Update count of requested engines because some
1262 * of them might be shared with mirrored group
1263 */
1264 update_requested_engs(mirrored_eng_grp, engs, engs_cnt);
1265 }
1266
1267 /* Reserve engines */
1268 ret = reserve_engines(dev, eng_grp, engs, engs_cnt);
1269 if (ret)
1270 goto err_ucode_unload;
1271
1272 /* Update ucode pointers used by engines */
1273 update_ucode_ptrs(eng_grp);
1274
1275 /* Update engine masks used by this group */
1276 ret = eng_grp_update_masks(dev, eng_grp);
1277 if (ret)
1278 goto err_release_engs;
1279
1280 /* Create sysfs entry for engine group info */
1281 ret = create_sysfs_eng_grps_info(dev, eng_grp);
1282 if (ret)
1283 goto err_release_engs;
1284
1285 /* Enable engine group */
1286 ret = enable_eng_grp(eng_grp, eng_grps->obj);
1287 if (ret)
1288 goto err_release_engs;
1289
1290 /*
1291 * If this engine group mirrors another engine group
1292 * then we need to unload ucode as we will use ucode
1293 * from mirrored engine group
1294 */
1295 if (eng_grp->mirror.is_ena)
1296 ucode_unload(dev, &eng_grp->ucode[0]);
1297
1298 eng_grp->is_enabled = true;
1299 if (eng_grp->mirror.is_ena)
1300 dev_info(dev,
1301 "Engine_group%d: reuse microcode %s from group %d",
1302 eng_grp->idx, mirrored_eng_grp->ucode[0].ver_str,

                                               ^^^^^^^^^^^^^^^^^^

and an unchecked dereference.

regards,
dan carpenter