net/mac80211/util.c:1029:1: warning: stack frame size (2544) exceeds limit (2048) in '_ieee802_11_parse_elems_full'

From: kernel test robot
Date: Sun Jul 23 2023 - 17:37:06 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 269f4a4b85a1b61e94bf935b30c56a938e92f585
commit: fd17bf041b40e3dac705c4313854becbe07b7557 wifi: mac80211: refactor elements parsing with parameter struct
date: 1 year ago
config: riscv-randconfig-r042-20230724 (https://download.01.org/0day-ci/archive/20230724/202307240553.vW7TtnHW-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230724/202307240553.vW7TtnHW-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307240553.vW7TtnHW-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> net/mac80211/util.c:1029:1: warning: stack frame size (2544) exceeds limit (2048) in '_ieee802_11_parse_elems_full' [-Wframe-larger-than]
1029 | _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
| ^
1 warning generated.

vim +/_ieee802_11_parse_elems_full +1029 net/mac80211/util.c

1027
1028 static u32
> 1029 _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
1030 struct ieee802_11_elems *elems,
1031 const struct element *check_inherit)
1032 {
1033 const struct element *elem;
1034 bool calc_crc = params->filter != 0;
1035 DECLARE_BITMAP(seen_elems, 256);
1036 u32 crc = params->crc;
1037 const u8 *ie;
1038
1039 bitmap_zero(seen_elems, 256);
1040
1041 for_each_element(elem, params->start, params->len) {
1042 bool elem_parse_failed;
1043 u8 id = elem->id;
1044 u8 elen = elem->datalen;
1045 const u8 *pos = elem->data;
1046
1047 if (check_inherit &&
1048 !cfg80211_is_element_inherited(elem,
1049 check_inherit))
1050 continue;
1051
1052 switch (id) {
1053 case WLAN_EID_SSID:
1054 case WLAN_EID_SUPP_RATES:
1055 case WLAN_EID_FH_PARAMS:
1056 case WLAN_EID_DS_PARAMS:
1057 case WLAN_EID_CF_PARAMS:
1058 case WLAN_EID_TIM:
1059 case WLAN_EID_IBSS_PARAMS:
1060 case WLAN_EID_CHALLENGE:
1061 case WLAN_EID_RSN:
1062 case WLAN_EID_ERP_INFO:
1063 case WLAN_EID_EXT_SUPP_RATES:
1064 case WLAN_EID_HT_CAPABILITY:
1065 case WLAN_EID_HT_OPERATION:
1066 case WLAN_EID_VHT_CAPABILITY:
1067 case WLAN_EID_VHT_OPERATION:
1068 case WLAN_EID_MESH_ID:
1069 case WLAN_EID_MESH_CONFIG:
1070 case WLAN_EID_PEER_MGMT:
1071 case WLAN_EID_PREQ:
1072 case WLAN_EID_PREP:
1073 case WLAN_EID_PERR:
1074 case WLAN_EID_RANN:
1075 case WLAN_EID_CHANNEL_SWITCH:
1076 case WLAN_EID_EXT_CHANSWITCH_ANN:
1077 case WLAN_EID_COUNTRY:
1078 case WLAN_EID_PWR_CONSTRAINT:
1079 case WLAN_EID_TIMEOUT_INTERVAL:
1080 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1081 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1082 case WLAN_EID_CHAN_SWITCH_PARAM:
1083 case WLAN_EID_EXT_CAPABILITY:
1084 case WLAN_EID_CHAN_SWITCH_TIMING:
1085 case WLAN_EID_LINK_ID:
1086 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
1087 case WLAN_EID_RSNX:
1088 case WLAN_EID_S1G_BCN_COMPAT:
1089 case WLAN_EID_S1G_CAPABILITIES:
1090 case WLAN_EID_S1G_OPERATION:
1091 case WLAN_EID_AID_RESPONSE:
1092 case WLAN_EID_S1G_SHORT_BCN_INTERVAL:
1093 /*
1094 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
1095 * that if the content gets bigger it might be needed more than once
1096 */
1097 if (test_bit(id, seen_elems)) {
1098 elems->parse_error = true;
1099 continue;
1100 }
1101 break;
1102 }
1103
1104 if (calc_crc && id < 64 && (params->filter & (1ULL << id)))
1105 crc = crc32_be(crc, pos - 2, elen + 2);
1106
1107 elem_parse_failed = false;
1108
1109 switch (id) {
1110 case WLAN_EID_LINK_ID:
1111 if (elen + 2 < sizeof(struct ieee80211_tdls_lnkie)) {
1112 elem_parse_failed = true;
1113 break;
1114 }
1115 elems->lnk_id = (void *)(pos - 2);
1116 break;
1117 case WLAN_EID_CHAN_SWITCH_TIMING:
1118 if (elen < sizeof(struct ieee80211_ch_switch_timing)) {
1119 elem_parse_failed = true;
1120 break;
1121 }
1122 elems->ch_sw_timing = (void *)pos;
1123 break;
1124 case WLAN_EID_EXT_CAPABILITY:
1125 elems->ext_capab = pos;
1126 elems->ext_capab_len = elen;
1127 break;
1128 case WLAN_EID_SSID:
1129 elems->ssid = pos;
1130 elems->ssid_len = elen;
1131 break;
1132 case WLAN_EID_SUPP_RATES:
1133 elems->supp_rates = pos;
1134 elems->supp_rates_len = elen;
1135 break;
1136 case WLAN_EID_DS_PARAMS:
1137 if (elen >= 1)
1138 elems->ds_params = pos;
1139 else
1140 elem_parse_failed = true;
1141 break;
1142 case WLAN_EID_TIM:
1143 if (elen >= sizeof(struct ieee80211_tim_ie)) {
1144 elems->tim = (void *)pos;
1145 elems->tim_len = elen;
1146 } else
1147 elem_parse_failed = true;
1148 break;
1149 case WLAN_EID_VENDOR_SPECIFIC:
1150 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
1151 pos[2] == 0xf2) {
1152 /* Microsoft OUI (00:50:F2) */
1153
1154 if (calc_crc)
1155 crc = crc32_be(crc, pos - 2, elen + 2);
1156
1157 if (elen >= 5 && pos[3] == 2) {
1158 /* OUI Type 2 - WMM IE */
1159 if (pos[4] == 0) {
1160 elems->wmm_info = pos;
1161 elems->wmm_info_len = elen;
1162 } else if (pos[4] == 1) {
1163 elems->wmm_param = pos;
1164 elems->wmm_param_len = elen;
1165 }
1166 }
1167 }
1168 break;
1169 case WLAN_EID_RSN:
1170 elems->rsn = pos;
1171 elems->rsn_len = elen;
1172 break;
1173 case WLAN_EID_ERP_INFO:
1174 if (elen >= 1)
1175 elems->erp_info = pos;
1176 else
1177 elem_parse_failed = true;
1178 break;
1179 case WLAN_EID_EXT_SUPP_RATES:
1180 elems->ext_supp_rates = pos;
1181 elems->ext_supp_rates_len = elen;
1182 break;
1183 case WLAN_EID_HT_CAPABILITY:
1184 if (elen >= sizeof(struct ieee80211_ht_cap))
1185 elems->ht_cap_elem = (void *)pos;
1186 else
1187 elem_parse_failed = true;
1188 break;
1189 case WLAN_EID_HT_OPERATION:
1190 if (elen >= sizeof(struct ieee80211_ht_operation))
1191 elems->ht_operation = (void *)pos;
1192 else
1193 elem_parse_failed = true;
1194 break;
1195 case WLAN_EID_VHT_CAPABILITY:
1196 if (elen >= sizeof(struct ieee80211_vht_cap))
1197 elems->vht_cap_elem = (void *)pos;
1198 else
1199 elem_parse_failed = true;
1200 break;
1201 case WLAN_EID_VHT_OPERATION:
1202 if (elen >= sizeof(struct ieee80211_vht_operation)) {
1203 elems->vht_operation = (void *)pos;
1204 if (calc_crc)
1205 crc = crc32_be(crc, pos - 2, elen + 2);
1206 break;
1207 }
1208 elem_parse_failed = true;
1209 break;
1210 case WLAN_EID_OPMODE_NOTIF:
1211 if (elen > 0) {
1212 elems->opmode_notif = pos;
1213 if (calc_crc)
1214 crc = crc32_be(crc, pos - 2, elen + 2);
1215 break;
1216 }
1217 elem_parse_failed = true;
1218 break;
1219 case WLAN_EID_MESH_ID:
1220 elems->mesh_id = pos;
1221 elems->mesh_id_len = elen;
1222 break;
1223 case WLAN_EID_MESH_CONFIG:
1224 if (elen >= sizeof(struct ieee80211_meshconf_ie))
1225 elems->mesh_config = (void *)pos;
1226 else
1227 elem_parse_failed = true;
1228 break;
1229 case WLAN_EID_PEER_MGMT:
1230 elems->peering = pos;
1231 elems->peering_len = elen;
1232 break;
1233 case WLAN_EID_MESH_AWAKE_WINDOW:
1234 if (elen >= 2)
1235 elems->awake_window = (void *)pos;
1236 break;
1237 case WLAN_EID_PREQ:
1238 elems->preq = pos;
1239 elems->preq_len = elen;
1240 break;
1241 case WLAN_EID_PREP:
1242 elems->prep = pos;
1243 elems->prep_len = elen;
1244 break;
1245 case WLAN_EID_PERR:
1246 elems->perr = pos;
1247 elems->perr_len = elen;
1248 break;
1249 case WLAN_EID_RANN:
1250 if (elen >= sizeof(struct ieee80211_rann_ie))
1251 elems->rann = (void *)pos;
1252 else
1253 elem_parse_failed = true;
1254 break;
1255 case WLAN_EID_CHANNEL_SWITCH:
1256 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
1257 elem_parse_failed = true;
1258 break;
1259 }
1260 elems->ch_switch_ie = (void *)pos;
1261 break;
1262 case WLAN_EID_EXT_CHANSWITCH_ANN:
1263 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
1264 elem_parse_failed = true;
1265 break;
1266 }
1267 elems->ext_chansw_ie = (void *)pos;
1268 break;
1269 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1270 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1271 elem_parse_failed = true;
1272 break;
1273 }
1274 elems->sec_chan_offs = (void *)pos;
1275 break;
1276 case WLAN_EID_CHAN_SWITCH_PARAM:
1277 if (elen <
1278 sizeof(*elems->mesh_chansw_params_ie)) {
1279 elem_parse_failed = true;
1280 break;
1281 }
1282 elems->mesh_chansw_params_ie = (void *)pos;
1283 break;
1284 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1285 if (!params->action ||
1286 elen < sizeof(*elems->wide_bw_chansw_ie)) {
1287 elem_parse_failed = true;
1288 break;
1289 }
1290 elems->wide_bw_chansw_ie = (void *)pos;
1291 break;
1292 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1293 if (params->action) {
1294 elem_parse_failed = true;
1295 break;
1296 }
1297 /*
1298 * This is a bit tricky, but as we only care about
1299 * the wide bandwidth channel switch element, so
1300 * just parse it out manually.
1301 */
1302 ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1303 pos, elen);
1304 if (ie) {
1305 if (ie[1] >= sizeof(*elems->wide_bw_chansw_ie))
1306 elems->wide_bw_chansw_ie =
1307 (void *)(ie + 2);
1308 else
1309 elem_parse_failed = true;
1310 }
1311 break;
1312 case WLAN_EID_COUNTRY:
1313 elems->country_elem = pos;
1314 elems->country_elem_len = elen;
1315 break;
1316 case WLAN_EID_PWR_CONSTRAINT:
1317 if (elen != 1) {
1318 elem_parse_failed = true;
1319 break;
1320 }
1321 elems->pwr_constr_elem = pos;
1322 break;
1323 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1324 /* Lots of different options exist, but we only care
1325 * about the Dynamic Transmit Power Control element.
1326 * First check for the Cisco OUI, then for the DTPC
1327 * tag (0x00).
1328 */
1329 if (elen < 4) {
1330 elem_parse_failed = true;
1331 break;
1332 }
1333
1334 if (pos[0] != 0x00 || pos[1] != 0x40 ||
1335 pos[2] != 0x96 || pos[3] != 0x00)
1336 break;
1337
1338 if (elen != 6) {
1339 elem_parse_failed = true;
1340 break;
1341 }
1342
1343 if (calc_crc)
1344 crc = crc32_be(crc, pos - 2, elen + 2);
1345
1346 elems->cisco_dtpc_elem = pos;
1347 break;
1348 case WLAN_EID_ADDBA_EXT:
1349 if (elen < sizeof(struct ieee80211_addba_ext_ie)) {
1350 elem_parse_failed = true;
1351 break;
1352 }
1353 elems->addba_ext_ie = (void *)pos;
1354 break;
1355 case WLAN_EID_TIMEOUT_INTERVAL:
1356 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1357 elems->timeout_int = (void *)pos;
1358 else
1359 elem_parse_failed = true;
1360 break;
1361 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
1362 if (elen >= sizeof(*elems->max_idle_period_ie))
1363 elems->max_idle_period_ie = (void *)pos;
1364 break;
1365 case WLAN_EID_RSNX:
1366 elems->rsnx = pos;
1367 elems->rsnx_len = elen;
1368 break;
1369 case WLAN_EID_TX_POWER_ENVELOPE:
1370 if (elen < 1 ||
1371 elen > sizeof(struct ieee80211_tx_pwr_env))
1372 break;
1373
1374 if (elems->tx_pwr_env_num >= ARRAY_SIZE(elems->tx_pwr_env))
1375 break;
1376
1377 elems->tx_pwr_env[elems->tx_pwr_env_num] = (void *)pos;
1378 elems->tx_pwr_env_len[elems->tx_pwr_env_num] = elen;
1379 elems->tx_pwr_env_num++;
1380 break;
1381 case WLAN_EID_EXTENSION:
1382 ieee80211_parse_extension_element(calc_crc ?
1383 &crc : NULL,
1384 elem, elems);
1385 break;
1386 case WLAN_EID_S1G_CAPABILITIES:
1387 if (elen >= sizeof(*elems->s1g_capab))
1388 elems->s1g_capab = (void *)pos;
1389 else
1390 elem_parse_failed = true;
1391 break;
1392 case WLAN_EID_S1G_OPERATION:
1393 if (elen == sizeof(*elems->s1g_oper))
1394 elems->s1g_oper = (void *)pos;
1395 else
1396 elem_parse_failed = true;
1397 break;
1398 case WLAN_EID_S1G_BCN_COMPAT:
1399 if (elen == sizeof(*elems->s1g_bcn_compat))
1400 elems->s1g_bcn_compat = (void *)pos;
1401 else
1402 elem_parse_failed = true;
1403 break;
1404 case WLAN_EID_AID_RESPONSE:
1405 if (elen == sizeof(struct ieee80211_aid_response_ie))
1406 elems->aid_resp = (void *)pos;
1407 else
1408 elem_parse_failed = true;
1409 break;
1410 default:
1411 break;
1412 }
1413
1414 if (elem_parse_failed)
1415 elems->parse_error = true;
1416 else
1417 __set_bit(id, seen_elems);
1418 }
1419
1420 if (!for_each_element_completed(elem, params->start, params->len))
1421 elems->parse_error = true;
1422
1423 return crc;
1424 }
1425

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