shithub: jbig2

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bug 694281: fix memory leaks and compilation warnings

* jbig2_build_huffman_table leaks LENCOUNT and result under OOM conditions
* jbig2_decode_symbol_dict leaks an image in an error case
* jbig2_symbol_dictionary skips cleanup in an error case
* jbig2_text_region leaks GR_stats in various error and non-error cases
* MSVC reports two "unreachable code" warnings and a "signed/unsigned
  mismatch" one

--- a/jbig2.c

+++ b/jbig2.c

@@ -390,7 +390,6 @@

 		      "Garbage beyond end of file");

 	}

     }

-  return 0;

 }

 void

--- a/jbig2_huffman.c

+++ b/jbig2_huffman.c

@@ -414,6 +414,7 @@

   {

     jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1,

         "couldn't allocate result storage in jbig2_build_huffman_table");

+    jbig2_free(ctx->allocator, LENCOUNT);

     return NULL;

   }

   result->log_table_size = log_table_size;

@@ -422,6 +423,8 @@

   {

     jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1,

         "couldn't allocate entries storage in jbig2_build_huffman_table");

+    jbig2_free(ctx->allocator, result);

+    jbig2_free(ctx->allocator, LENCOUNT);

     return NULL;

   }

   /* fill now to catch missing JBIG2Globals later */

@@ -565,7 +568,7 @@

         size_t boffset = 0;

         /* B.2 4) */

         int32_t CURRANGELOW = HTLOW;

-        int NTEMP = 0;

+        size_t NTEMP = 0;

 #ifdef JBIG2_DEBUG

         jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number, 

--- a/jbig2_segment.c

+++ b/jbig2_segment.c

@@ -244,8 +244,6 @@

                     "unhandled extension segment");

             }

     }

-

-    return 0;

 }

 /* general segment parsing dispatch */

--- a/jbig2_symbol_dict.c

+++ b/jbig2_symbol_dict.c

@@ -442,7 +442,10 @@

 		  code = jbig2_decode_generic_region(ctx, segment, &region_params,

               as, image, GB_stats);

-          if (code < 0) goto cleanup4;

+          if (code < 0) {

+              jbig2_image_release(ctx, image);

+              goto cleanup4;

+          }

           SDNEWSYMS->glyphs[NSYMSDECODED] = image;

 	      } else {

@@ -950,7 +953,7 @@

         break;

       case 2:

       default:

-	return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

+	jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

 	    "symbol dictionary specified invalid huffman table");

 	break;

     }

--- a/jbig2_text.c

+++ b/jbig2_text.c

@@ -857,7 +857,7 @@

     if (image == NULL) {

         code =jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

             "couldn't allocate text region image");

-        goto cleanup1;

+        goto cleanup2;

     }

     ws = jbig2_word_stream_buf_new(ctx, segment_data + offset, segment->data_length - offset);

@@ -957,9 +957,7 @@

     jbig2_word_stream_buf_free(ctx, ws);

 cleanup2:

-    if (!params.SBHUFF && params.SBREFINE) {

-        jbig2_free(ctx->allocator, GR_stats);

-    }

+    jbig2_free(ctx->allocator, GR_stats);

     jbig2_image_release(ctx, image);

 cleanup1: