--- /dev/null
+From 5b6641978e8fa68bca05d224a61f8513b010eda8 Mon Sep 17 00:00:00 2001
+From: Coleman <omegacoleman@gmail.com>
+Date: Fri, 17 Jul 2020 08:53:00 +0800
+Subject: [PATCH] Fix using sprintf for extending string, which causes
+ undefined behavior
+
+[Upstream: https://github.com/abperiasamy/rtl8812AU_8821AU_linux/commit/be57045a0933d64e958878696883e9cf998e1bf3.patch]
+Signed-off-by: Coleman <omegacoleman@gmail.com>
+Signed-off-by: Christian Stewart <christian@paral.in>
+---
+ core/rtw_mp.c | 2 +-
+ os_dep/linux/ioctl_linux.c | 108 ++++++++++++++++++-------------------
+ 2 files changed, 55 insertions(+), 55 deletions(-)
+
+diff --git a/core/rtw_mp.c b/core/rtw_mp.c
+index c2e400d..989bb3e 100644
+--- a/core/rtw_mp.c
++++ b/core/rtw_mp.c
+@@ -1871,7 +1871,7 @@ u32 mp_query_psd(PADAPTER pAdapter, u8 *data)
+ } else {
+ psd_data = rtw_GetPSDData(pAdapter, i);
+ }
+- sprintf(data, "%s%x ", data, psd_data);
++ sprintf(data + strlen(data), "%x ", psd_data);
+ i++;
+ }
+
+diff --git a/os_dep/linux/ioctl_linux.c b/os_dep/linux/ioctl_linux.c
+index c74a153..9543fa3 100644
+--- a/os_dep/linux/ioctl_linux.c
++++ b/os_dep/linux/ioctl_linux.c
+@@ -9080,19 +9080,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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) {
+@@ -9107,19 +9107,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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) {
+@@ -9158,7 +9158,7 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ *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) {
+@@ -9174,17 +9174,17 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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");
+@@ -9269,10 +9269,10 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ *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");
+@@ -9330,10 +9330,10 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ *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");
+@@ -9355,19 +9355,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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) {
+@@ -9384,19 +9384,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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) {
+@@ -9436,7 +9436,7 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ // 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);
+@@ -9445,19 +9445,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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) {
+@@ -9465,19 +9465,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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) {
+@@ -9485,19 +9485,19 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ 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");
+
+@@ -9523,7 +9523,7 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ *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)) {
+@@ -9547,7 +9547,7 @@ static int rtw_mp_efuse_get(struct net_device *dev,
+ *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!");
+@@ -10409,7 +10409,7 @@ static int rtw_mp_read_reg(struct net_device *dev,
+ pnext++;
+ if ( *pnext != '\0' ) {
+ strtout = simple_strtoul (pnext , &ptmp, 16);
+- sprintf( extra, "%s %d" ,extra ,strtout );
++ sprintf(extra + strlen(extra), " %d" ,strtout );
+ } else {
+ break;
+ }
+@@ -10443,7 +10443,7 @@ static int rtw_mp_read_reg(struct net_device *dev,
+ pnext++;
+ if ( *pnext != '\0' ) {
+ strtout = simple_strtoul (pnext , &ptmp, 16);
+- sprintf( extra, "%s %d" ,extra ,strtout );
++ sprintf(extra + strlen(extra), " %d" ,strtout );
+ } else {
+ break;
+ }
+@@ -10566,7 +10566,7 @@ static int rtw_mp_read_rf(struct net_device *dev,
+ pnext++;
+ if ( *pnext != '\0' ) {
+ strtou = simple_strtoul (pnext , &ptmp, 16);
+- sprintf( extra, "%s %d" ,extra ,strtou );
++ sprintf(extra + strlen(extra), " %d" ,strtou );
+ } else {
+ break;
+ }
+@@ -12155,14 +12155,14 @@ todo:
+ 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]);
+ }
+ }
+
+--
+2.28.0
+