diff --git a/src/coreclr/pal/src/file/filetime.cpp b/src/coreclr/pal/src/file/filetime.cpp
index 2500d234d8b65a..d038c9f29eb595 100644
--- a/src/coreclr/pal/src/file/filetime.cpp
+++ b/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;
 
diff --git a/src/coreclr/pal/src/thread/process.cpp b/src/coreclr/pal/src/thread/process.cpp
index f9f2703cf4b23d..b23eab001cca4e 100644
--- a/src/coreclr/pal/src/thread/process.cpp
+++ b/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;
 
diff --git a/src/coreclr/tools/aot/ILCompiler.ReadyToRun/IBC/IBCProfileParser.cs b/src/coreclr/tools/aot/ILCompiler.ReadyToRun/IBC/IBCProfileParser.cs
index b119f3bce5e4f7..dfc21b015428ea 100644
--- a/src/coreclr/tools/aot/ILCompiler.ReadyToRun/IBC/IBCProfileParser.cs
+++ b/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;
diff --git a/src/libraries/System.Configuration.ConfigurationManager/src/System/Configuration/MgmtConfigurationRecord.cs b/src/libraries/System.Configuration.ConfigurationManager/src/System/Configuration/MgmtConfigurationRecord.cs
index 31e148711d8db6..4bcfe2a999fbbf 100644
--- a/src/libraries/System.Configuration.ConfigurationManager/src/System/Configuration/MgmtConfigurationRecord.cs
+++ b/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;