Merge pull request #94 from chschneider/fix-memory-leak-uncompress

Fix a memory leak with zstd_uncompress/zstd_uncompress_dict

Author: kjdev

tests/memory_001.phpt

@@ -0,0 +1,11 @@
+--TEST--
+memory_usage regression in 0.15.0
+--FILE--
+<?php
+$start = memory_get_usage();
+zstd_uncompress(zstd_compress(str_repeat('a', 1000)));
+$end = memory_get_usage();
+echo ($end - $start) . "\n";
+?>
+--EXPECT--
+0

zstd.c

@@ -527,7 +527,7 @@ ZEND_FUNCTION(zstd_uncompress)
     ctx.input.size = ZSTR_LEN(input);
     ctx.input.pos = 0;
 
-    ctx.output.dst = emalloc(size);
+    ctx.output.dst = erealloc(ctx.output.dst, size);
     ctx.output.size = size;
     ctx.output.pos = 0;
 
@@ -646,7 +646,7 @@ ZEND_FUNCTION(zstd_uncompress_dict)
     ctx.input.size = ZSTR_LEN(input);
     ctx.input.pos = 0;
 
-    ctx.output.dst = emalloc(size);
+    ctx.output.dst = erealloc(ctx.output.dst, size);
     ctx.output.size = size;
     ctx.output.pos = 0;