runtime: minor bugs fixed in coreclr and libraries (dotnet#97155)

* Fixed error: <Pointer, returned from function 'gmtime_r' at filetime.cpp:262, may be NULL and is dereferenced at filetime.cpp:268>. The error was detected using the Svace analyzer maded by ISP RAS.

* Fixed error: <Return value of a function 'PAL_wcsrchr' is dereferenced at process.cpp:2824 without checking for NULL, but it is usually checked for this function (11/12)>. The error was detected using the Svace analyzer maded by ISP RAS.

* Fixed error: <Value sectionRecord, which is result of method invocation with possible null return value, is dereferenced in member access expression sectionRecord.HasLocationInput>. The error was detected using the Svace analyzer maded by ISP RAS.

* Fixed error: <Maybe ecmaCandidateMethod, that created from method with AS-cast should be compared with null instead of method>. The error was detected using the Svace analyzer maded by ISP RAS.

* Update filetime.cpp

* Update process.cpp

* Update MgmtConfigurationRecord.cs

* Update src/libraries/System.Configuration.ConfigurationManager/src/System/Configuration/MgmtConfigurationRecord.cs

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

* Update src/libraries/System.Configuration.ConfigurationManager/src/System/Configuration/MgmtConfigurationRecord.cs

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

---------

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

src/coreclr/pal/src/file/filetime.cpp

@@ -263,7 +263,13 @@ BOOL PALAPI FileTimeToSystemTime( CONST FILETIME * lpFileTime,
 #else   /* HAVE_GMTIME_R */
         UnixSystemTime = gmtime( &UnixFileTime );
 #endif  /* HAVE_GMTIME_R */
-
+        if (!UnixSystemTime)
+        {
+	       ERROR( "gmtime failed.\n" );
+	       SetLastError(ERROR_INVALID_PARAMETER);
+	       return FALSE;
+	    }
+
         /* Convert unix system time to Windows system time. */
         lpSystemTime->wDay      = (WORD)UnixSystemTime->tm_mday;
 

src/coreclr/pal/src/thread/process.cpp

@@ -2821,6 +2821,12 @@ CorUnix::InitializeProcessCommandLine(
     if (lpwstrFullPath)
     {
         LPWSTR lpwstr = PAL_wcsrchr(lpwstrFullPath, '/');
+        if (!lpwstr)
+        {
+            ERROR("Invalid full path\n");
+            palError = ERROR_INTERNAL_ERROR;
+            goto exit;
+        }    
         lpwstr[0] = '\0';
         size_t n = PAL_wcslen(lpwstrFullPath) + 1;
 

src/coreclr/tools/aot/ILCompiler.ReadyToRun/IBC/IBCProfileParser.cs

@@ -414,7 +414,7 @@ private uint LookupIbcMethodToken(MetadataType methodMetadataType, uint ibcToken
                 if (method.Name == methodName)
                 {
                     EcmaMethod ecmaCandidateMethod = method as EcmaMethod;
-                    if (method == null)
+                    if (ecmaCandidateMethod == null)
                         continue;
 
                     MetadataReader metadataReader = ecmaCandidateMethod.MetadataReader;

src/libraries/System.Configuration.ConfigurationManager/src/System/Configuration/MgmtConfigurationRecord.cs

@@ -335,6 +335,7 @@ internal ConfigurationSection FindImmediateParentSection(ConfigurationSection se
 
             string configKey = section.SectionInformation.SectionName;
             SectionRecord sectionRecord = GetSectionRecord(configKey, false);
+            Debug.Assert(sectionRecord != null);
             if (sectionRecord.HasLocationInputs)
             {
                 SectionInput input = sectionRecord.LastLocationInput;