diff -ruN a/drivers/net/wireless/rtl8812au/core/rtw_mp.c b/drivers/net/wireless/rtl8812au/core/rtw_mp.c
--- a/drivers/net/wireless/rtl8812au/core/rtw_mp.c	2020-08-20 02:08:41.000000000 -0600
+++ b/drivers/net/wireless/rtl8812au/core/rtw_mp.c	2021-05-12 20:51:59.858880819 -0600
@@ -1871,7 +1871,7 @@
 		} else {
 			psd_data = rtw_GetPSDData(pAdapter, i);
 		}
-		sprintf(data, "%s%x ", data, psd_data);
+		sprintf(data + strlen(data), "%x ", psd_data);
 		i++;
 	}
 
diff -ruN a/drivers/net/wireless/rtl8812au/os_dep/linux/ioctl_linux.c b/drivers/net/wireless/rtl8812au/os_dep/linux/ioctl_linux.c
--- a/drivers/net/wireless/rtl8812au/os_dep/linux/ioctl_linux.c	2020-08-20 02:08:41.000000000 -0600
+++ b/drivers/net/wireless/rtl8812au/os_dep/linux/ioctl_linux.c	2021-05-12 20:53:45.926325818 -0600
@@ -9068,19 +9068,19 @@
 		sprintf(extra, "\n");
 		for (i = 0; i < EFUSE_MAP_SIZE; i += 16) {
 //			DBG_871X("0x%02x\t", i);
-			sprintf(extra, "%s0x%02x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%02x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", data[i+j]);
-				sprintf(extra, "%s%02X ", extra, PROMContent[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", PROMContent[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra, "%s\t", extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", data[i+j]);
-				sprintf(extra, "%s%02X ", extra, PROMContent[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", PROMContent[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra,"%s\n",extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 	} else if (strcmp(tmp[0], "realmap") == 0) {
@@ -9095,19 +9095,19 @@
 		sprintf(extra, "\n");
 		for (i = 0; i < EFUSE_MAP_SIZE; i += 16) {
 //			DBG_871X("0x%02x\t", i);
-			sprintf(extra, "%s0x%02x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%02x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", data[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeEfuseInitMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeEfuseInitMap[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra, "%s\t", extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", data[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeEfuseInitMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeEfuseInitMap[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra,"%s\n",extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 	} else if (strcmp(tmp[0], "rmap") == 0) {
@@ -9146,7 +9146,7 @@
 		*extra = 0;
 		for (i=0; i<cnts; i++) {
 //			DBG_871X("0x%02x ", data[i]);
-			sprintf(extra, "%s0x%02X ", extra, data[i]);
+			sprintf(extra + strlen(extra), "0x%02X ", data[i]);
 		}
 //		DBG_871X("}\n");
 	} else if (strcmp(tmp[0], "realraw") == 0) {
@@ -9162,17 +9162,17 @@
 		sprintf(extra, "\n0x00\t");
 		for (i=0; i< mapLen; i++) {
 			//			DBG_871X("%02X", rawdata[i]);
-			sprintf(extra, "%s%02X", extra, rawdata[i]);
+			sprintf(extra + strlen(extra), "%02X", rawdata[i]);
 			if ((i & 0xF) == 0xF) {
 				//				DBG_871X("\n");
-				sprintf(extra, "%s\n", extra);
-				sprintf(extra, "%s0x%02x\t", extra, i+1);
+				sprintf(extra + strlen(extra), "\n");
+				sprintf(extra + strlen(extra), "0x%02x\t", i+1);
 			} else if ((i & 0x7) == 0x7) {
 				//				DBG_871X("\t");
-				sprintf(extra, "%s \t", extra);
+				sprintf(extra + strlen(extra), " \t");
 			} else {
 				//				DBG_871X(" ");
-				sprintf(extra, "%s ", extra);
+				sprintf(extra + strlen(extra), " ");
 			}
 		}
 		//		DBG_871X("}\n");
@@ -9257,10 +9257,10 @@
 		*extra = 0;
 		for (i=0; i<cnts; i++) {
 //			DBG_871X("%02X", data[i]);
-			sprintf(extra, "%s%02X", extra, data[i]);
+			sprintf(extra + strlen(extra), "%02X", data[i]);
 			if (i != (cnts-1)) {
 //				DBG_871X(":");
-				sprintf(extra,"%s:",extra);
+				sprintf(extra + strlen(extra), ":");
 			}
 		}
 //		DBG_871X("}\n");
@@ -9318,10 +9318,10 @@
 		*extra = 0;
 		for (i=0; i<cnts; i++) {
 //			DBG_871X("0x%02x", data[i]);
-			sprintf(extra, "%s0x%02X", extra, data[i]);
+			sprintf(extra + strlen(extra), "0x%02X", data[i]);
 			if (i != (cnts-1)) {
 //				DBG_871X(",");
-				sprintf(extra,"%s,",extra);
+				sprintf(extra + strlen(extra), ",");
 			}
 		}
 //		DBG_871X("}\n");
@@ -9343,19 +9343,19 @@
 		sprintf(extra, "\n");
 		for (i=0; i<512; i+=16) { // set 512 because the iwpriv's extra size have limit 0x7FF
 //			DBG_871X("0x%03x\t", i);
-			sprintf(extra, "%s0x%03x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%03x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", pEfuseHal->BTEfuseInitMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->BTEfuseInitMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->BTEfuseInitMap[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra,"%s\t",extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", pEfuseHal->BTEfuseInitMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->BTEfuseInitMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->BTEfuseInitMap[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra, "%s\n", extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 	} else if (strcmp(tmp[0],"btbmap") == 0) {
@@ -9372,19 +9372,19 @@
 		sprintf(extra, "\n");
 		for (i=512; i<1024 ; i+=16) {
 //			DBG_871X("0x%03x\t", i);
-			sprintf(extra, "%s0x%03x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%03x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", data[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->BTEfuseInitMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->BTEfuseInitMap[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra,"%s\t",extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", data[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->BTEfuseInitMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->BTEfuseInitMap[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra, "%s\n", extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 	} else if (strcmp(tmp[0],"btrmap") == 0) {
@@ -9424,7 +9424,7 @@
 //		DBG_871X("%s: bt efuse data={", __FUNCTION__);
 		for (i=0; i<cnts; i++) {
 //			DBG_871X("0x%02x ", data[i]);
-			sprintf(extra, "%s 0x%02X ", extra, data[i]);
+			sprintf(extra + strlen(extra), " 0x%02X ", data[i]);
 		}
 //		DBG_871X("}\n");
 		DBG_871X(FUNC_ADPT_FMT ": BT MAC=[%s]\n", FUNC_ADPT_ARG(padapter), extra);
@@ -9433,19 +9433,19 @@
 		sprintf(extra, "\n");
 		for (i=0; i<512; i+=16) {
 //			DBG_871X("0x%03x\t", i);
-			sprintf(extra, "%s0x%03x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%03x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra, "%s\t", extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra, "%s\n", extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 	} else if (strcmp(tmp[0],"btbfake") == 0) {
@@ -9453,19 +9453,19 @@
 		sprintf(extra, "\n");
 		for (i=512; i<1024; i+=16) {
 //			DBG_871X("0x%03x\t", i);
-			sprintf(extra, "%s0x%03x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%03x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra, "%s\t", extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeBTEfuseModifiedMap[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra, "%s\n", extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 	} else if (strcmp(tmp[0],"wlrfkmap")== 0) {
@@ -9473,19 +9473,19 @@
 		sprintf(extra, "\n");
 		for (i=0; i<EFUSE_MAP_SIZE; i+=16) {
 //			DBG_871X("\t0x%02x\t", i);
-			sprintf(extra, "%s0x%02x\t", extra, i);
+			sprintf(extra + strlen(extra), "0x%02x\t", i);
 			for (j=0; j<8; j++) {
 //				DBG_871X("%02X ", pEfuseHal->fakeEfuseModifiedMap[i+j]);
-				sprintf(extra, "%s%02X ", extra, pEfuseHal->fakeEfuseModifiedMap[i+j]);
+				sprintf(extra + strlen(extra), "%02X ", pEfuseHal->fakeEfuseModifiedMap[i+j]);
 			}
 //			DBG_871X("\t");
-			sprintf(extra, "%s\t", extra);
+			sprintf(extra + strlen(extra), "\t");
 			for (; j<16; j++) {
 //				DBG_871X("%02X ", pEfuseHal->fakeEfuseModifiedMap[i+j]);
-				sprintf(extra, "%s %02X", extra, pEfuseHal->fakeEfuseModifiedMap[i+j]);
+				sprintf(extra + strlen(extra), " %02X", pEfuseHal->fakeEfuseModifiedMap[i+j]);
 			}
 //			DBG_871X("\n");
-			sprintf(extra, "%s\n", extra);
+			sprintf(extra + strlen(extra), "\n");
 		}
 //		DBG_871X("\n");
 
@@ -9511,7 +9511,7 @@
 		*extra = 0;
 		for (i=0; i<cnts; i++) {
 			DBG_871X("wlrfkrmap = 0x%02x \n", pEfuseHal->fakeEfuseModifiedMap[addr+i]);
-			sprintf(extra, "%s0x%02X ", extra, pEfuseHal->fakeEfuseModifiedMap[addr+i]);
+			sprintf(extra + strlen(extra), "0x%02X ", pEfuseHal->fakeEfuseModifiedMap[addr+i]);
 		}
 	} else if (strcmp(tmp[0],"btrfkrmap")== 0) {
 		if ((tmp[1]==NULL) || (tmp[2]==NULL)) {
@@ -9535,7 +9535,7 @@
 		*extra = 0;
 		for (i=0; i<cnts; i++) {
 			DBG_871X("wlrfkrmap = 0x%02x \n", pEfuseHal->fakeBTEfuseModifiedMap[addr+i]);
-			sprintf(extra, "%s0x%02X ", extra, pEfuseHal->fakeBTEfuseModifiedMap[addr+i]);
+			sprintf(extra + strlen(extra), "0x%02X ", pEfuseHal->fakeBTEfuseModifiedMap[addr+i]);
 		}
 	} else {
 		sprintf(extra, "Command not found!");
@@ -10378,7 +10378,7 @@
 			pnext++;
 			if ( *pnext != '\0' ) {
 				strtout = simple_strtoul (pnext , &ptmp, 16);
-				sprintf( extra, "%s %d" ,extra ,strtout );
+				sprintf(extra + strlen(extra), " %d"  ,strtout );
 			} else {
 				break;
 			}
@@ -10412,7 +10412,7 @@
 			pnext++;
 			if ( *pnext != '\0' ) {
 				strtout = simple_strtoul (pnext , &ptmp, 16);
-				sprintf( extra, "%s %d" ,extra ,strtout );
+				sprintf(extra + strlen(extra), " %d"  ,strtout );
 			} else {
 				break;
 			}
@@ -10525,7 +10525,7 @@
 		pnext++;
 		if ( *pnext != '\0' ) {
 			strtou = simple_strtoul (pnext , &ptmp, 16);
-			sprintf( extra, "%s %d" ,extra ,strtou );
+			sprintf(extra + strlen(extra), " %d"  ,strtou );
 		} else {
 			break;
 		}
@@ -11985,14 +11985,14 @@
 				goto exit;
 
 #ifdef CONFIG_RTL8723A
-			sprintf(extra, "%s %d ", extra, (pMptCtx->mptOutBuf[i]& 0x3f));
+			sprintf(extra + strlen(extra), " %d ", (pMptCtx->mptOutBuf[i]& 0x3f));
 #else
-			sprintf(extra, "%s %d ", extra, (pMptCtx->mptOutBuf[i]& 0x1f));
+			sprintf(extra + strlen(extra), " %d ", (pMptCtx->mptOutBuf[i]& 0x1f));
 #endif
 		}
 	} else {
 		for (i=4; i<pMptCtx->mptOutLen; i++) {
-			sprintf(extra, "%s 0x%x ", extra, pMptCtx->mptOutBuf[i]);
+			sprintf(extra + strlen(extra), " 0x%x ", pMptCtx->mptOutBuf[i]);
 		}
 	}