direct_bt::DBTManager, ieee11073::DataTypes: Fix Warnings

2 files changed, 12 insertions, 5 deletions

diff --git a/src/direct_bt/DBTManager.cpp b/src/direct_bt/DBTManager.cpp
index 454e6f6f..0778457e 100644
--- a/src/direct_bt/DBTManager.cpp
+++ b/src/direct_bt/DBTManager.cpp
@@ -612,8 +612,13 @@ ScanType DBTManager::startDiscovery(const int dev_id, const ScanType scanType) n
     ScanType type = ScanType::NONE;
     if( nullptr != res && res->getOpcode() == MgmtEvent::Opcode::CMD_COMPLETE ) {
         const MgmtEvtCmdComplete &res1 = *static_cast<const MgmtEvtCmdComplete *>(res.get());
-        if( MgmtStatus::SUCCESS == res1.getStatus() && 1 == res1.getDataSize() ) {
-            type = static_cast<ScanType>( *res1.getData() );
+        if( MgmtStatus::SUCCESS == res1.getStatus() && 1 <= res1.getDataSize() ) {
+            const uint8_t *p = res1.getData();
+            if( nullptr == p ) { // G++ 10: -Werror=null-dereference
+                ERR_PRINT("DBTManager::startDiscovery: Impossible MgmtEvtCmdComplete data nullptr: %s - %s", res1.toString().c_str(), req.toString().c_str());
+                return type;
+            }
+            type = static_cast<ScanType>( p[0] );
         }
     }
     return type;
diff --git a/src/ieee11073/DataTypes.cpp b/src/ieee11073/DataTypes.cpp
index 97c53ab5..0cb47265 100644
--- a/src/ieee11073/DataTypes.cpp
+++ b/src/ieee11073/DataTypes.cpp
@@ -59,9 +59,11 @@ AbsoluteTime::AbsoluteTime(const uint8_t * data_le, const int size) {
 
 std::string AbsoluteTime::toString() const {
     char cbuf[24]; // '2020-04-04 10:58:59' 19 + second_fractions
-    snprintf(cbuf, sizeof(cbuf), "%4.4d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d",
-            (int)year, (int)month, (int)day, (int)hour, (int)minute, (int)second);
-
+    const size_t count = snprintf(cbuf, sizeof(cbuf), "%4.4d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d",
+                               (int)year, (int)month, (int)day, (int)hour, (int)minute, (int)second);
+    if( count >= sizeof(cbuf) ) { // truncated?
+        throw jau::InternalError("snprintf date-format truncated "+std::to_string(count)+" >= "+std::to_string(sizeof(cbuf)), E_FILE_LINE);
+    }
     std::string res(cbuf);
     if( 0 != second_fractions ) {
         res += "."+std::to_string(second_fractions);