Tidies and minor bug fix resulting from Coverity Scan issues.

ChangeLog

@@ -140,6 +140,15 @@ particular when it is serialized.
 27. Update pcre2test, remove some unused code in pcre2_match(), and upgrade the 
 tests to improve coverage.
 
+28. Some fixes/tidies as a result of looking at Coverity Scan output:
+
+    (a) Typo: ">" should be ">=" in opcode check in pcre2_auto_possess.c.
+    (b) Added some casts to avoid "suspicious implicit sign extension". 
+    (c) Resource leaks in pcre2test in rare error cases. 
+    (d) Avoid warning for never-use case OP_TABLE_LENGTH which is just a fudge
+        for checking at compile time that tables are the right size.  
+    (e) Add missing "fall through" comment.     
+
 
 Version 10.23 14-February-2017
 ------------------------------

src/pcre2_auto_possess.c

@@ -1075,7 +1075,7 @@ for (;;)
   {
   c = *code;
 
-  if (c > OP_TABLE_LENGTH) return -1;   /* Something gone wrong */
+  if (c >= OP_TABLE_LENGTH) return -1;   /* Something gone wrong */
 
   if (c >= OP_STAR && c <= OP_TYPEPOSUPTO)
     {

src/pcre2_compile.c

@@ -8440,6 +8440,7 @@ for (;; pptr++)
     case META_BACKREF_BYNAME:
     if ((cb->external_options & PCRE2_MATCH_UNSET_BACKREF) != 0)
       goto ISNOTFIXED;
+    /* Fall through */   
 
     case META_RECURSE_BYNAME:
       {
@@ -9274,7 +9275,8 @@ possible because nowadays we limit the maximum value of cb.names_found and
 cb.name_entry_size. */
 
 re_blocksize = sizeof(pcre2_real_code) +
-  CU2BYTES(length + cb.names_found * cb.name_entry_size);
+  CU2BYTES(length + 
+  (PCRE2_SIZE)cb.names_found * (PCRE2_SIZE)cb.name_entry_size);
 re = (pcre2_real_code *)
   ccontext->memctl.malloc(re_blocksize, ccontext->memctl.memory_data);
 if (re == NULL)

src/pcre2_dfa_match.c

@@ -697,7 +697,7 @@ for (;;)
       case OP_TABLE_LENGTH +
         ((sizeof(coptable) == OP_TABLE_LENGTH) &&
          (sizeof(poptable) == OP_TABLE_LENGTH)):
-      break;
+      return 0;
 
 /* ========================================================================== */
       /* Reached a closing bracket. If not at the end of the pattern, carry

src/pcre2_printint.c

@@ -340,7 +340,7 @@ for(;;)
       case OP_TABLE_LENGTH +
         ((sizeof(OP_names)/sizeof(const char *) == OP_TABLE_LENGTH) &&
         (sizeof(OP_lengths) == OP_TABLE_LENGTH)):
-      break;
+      return;
 /* ========================================================================== */
 
     case OP_END:

src/pcre2test.c

@@ -4434,7 +4434,7 @@ process_command(void)
 FILE *f;
 PCRE2_SIZE serial_size;
 size_t i;
-int rc, cmd, cmdlen;
+int rc, cmd, cmdlen, yield;
 uint16_t first_listed_newline;
 const char *cmdname;
 uint8_t *argptr, *serial;
@@ -4445,6 +4445,7 @@ if (restrict_for_perl_test)
   return PR_ABEND;
   }
 
+yield = PR_OK;
 cmd = CMD_UNKNOWN;
 cmdlen = 0;
 
@@ -4568,8 +4569,8 @@ switch(cmd)
     general_context);
   if (rc < 0)
     {
-    if (!serial_error(rc, "Serialization")) return PR_ABEND;
     fclose(f);
+    if (!serial_error(rc, "Serialization")) return PR_ABEND;
     break;
     }
 
@@ -4615,19 +4616,20 @@ switch(cmd)
     return PR_ABEND;
     }
 
-  if (fread(serial, 1, serial_size, f) != serial_size)
-    {
-    fprintf(outfile, "** Wrong return from fread()\n");
-    free(serial);
-    fclose(f);
-    return PR_ABEND;
-    }
+  i = fread(serial, 1, serial_size, f);
   fclose(f);
 
+  if (i != serial_size)
+    {
+    fprintf(outfile, "** Wrong return from fread()\n");
+    yield = PR_ABEND;
+    }
+  else
+    {
     PCRE2_SERIALIZE_GET_NUMBER_OF_CODES(rc, serial);
     if (rc < 0)
       {
-    if (!serial_error(rc, "Get number of codes")) return PR_ABEND;
+      if (!serial_error(rc, "Get number of codes")) yield = PR_ABEND;
       }
     else
       {
@@ -4643,16 +4645,17 @@ switch(cmd)
         general_context);
       if (rc < 0)
         {
-      if (!serial_error(rc, "Deserialization")) return PR_ABEND;
+        if (!serial_error(rc, "Deserialization")) yield = PR_ABEND;
         }
       else patstacknext += rc;
       }
+    }
 
   free(serial);
   break;
   }
 
-return PR_OK;
+return yield;
 }