diff --git a/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp b/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp
index 96ce7efe7..e01235882 100644
--- a/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp
+++ b/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp
@@ -299,6 +299,9 @@ class FLTReaderWriter : public ReaderWriter
                 opcode_type opcode = (opcode_type)dataStream.readUInt16();
                 size_type   size   = (size_type)dataStream.readUInt16();
 
+                if (size==0)
+                    return ReadResult::ERROR_IN_READING_FILE;
+
                 // variable length record complete?
                 if (!continuationBuffer.empty() && opcode!=CONTINUATION_OP)
                 {
diff --git a/src/osgPlugins/jpeg/ReaderWriterJPEG.cpp b/src/osgPlugins/jpeg/ReaderWriterJPEG.cpp
index a4cf5d3ea..9ef3b1199 100644
--- a/src/osgPlugins/jpeg/ReaderWriterJPEG.cpp
+++ b/src/osgPlugins/jpeg/ReaderWriterJPEG.cpp
@@ -614,6 +614,9 @@ class ReaderWriterJPEG : public osgDB::ReaderWriter
 {
         WriteResult::WriteStatus write_JPEG_file (std::ostream &fout,int image_width,int image_height,JSAMPLE* image_buffer,int quality = 100) const
         {
+            if ( (image_width == 0) || (image_height == 0) )
+                return WriteResult::ERROR_IN_WRITING_FILE;
+
             /* This struct contains the JPEG compression parameters and pointers to
             * working space (which is allocated as needed by the JPEG library).
             * It is possible to have several such structures, representing multiple
diff --git a/src/osgPlugins/pnm/ReaderWriterPNM.cpp b/src/osgPlugins/pnm/ReaderWriterPNM.cpp
index bc99efc6d..f3ccdbaa0 100644
--- a/src/osgPlugins/pnm/ReaderWriterPNM.cpp
+++ b/src/osgPlugins/pnm/ReaderWriterPNM.cpp
@@ -279,7 +279,8 @@ class ReaderWriterPNM : public osgDB::ReaderWriter
             int row;
             for (row = 1; row <= 3; row++)
             {
-                fgets(line, 300, fp);
+                if ( fgets(line, 300, fp) == NULL)
+                    break;
 
                 char *cp = line;
                 while (*cp && isspace(*cp))
@@ -326,7 +327,7 @@ class ReaderWriterPNM : public osgDB::ReaderWriter
                 ppmtype < 1 || ppmtype > 6)
             {
                 fclose(fp);
-                return ReadResult::FILE_NOT_HANDLED;
+                return ReadResult::ERROR_IN_READING_FILE;
             }
 
             int pixelFormat = 0;
diff --git a/src/osgPlugins/rgb/ReaderWriterRGB.cpp b/src/osgPlugins/rgb/ReaderWriterRGB.cpp
index 77af41920..cbc01953a 100644
--- a/src/osgPlugins/rgb/ReaderWriterRGB.cpp
+++ b/src/osgPlugins/rgb/ReaderWriterRGB.cpp
@@ -168,6 +168,8 @@ static rawImageRec *RawImageOpen(std::istream& fin)
     }
 
     fin.read((char*)raw,12);
+    if (!fin.good())
+        return NULL;
 
     if (raw->swapFlag)
     {
@@ -459,7 +461,7 @@ class ReaderWriterRGB : public osgDB::ReaderWriter
 
             if( (raw = RawImageOpen(fin)) == NULL )
             {
-                return ReadResult::FILE_NOT_HANDLED;
+                return ReadResult::ERROR_IN_READING_FILE;
             }
 
             int s = raw->sizeX;