File fix-LIST-memory-leak.patch of Package libantlr3c2

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File fix-LIST-memory-leak.patch of Package libantlr3c2 (Revision d15214ccc7426759737adb28bd5ec471)

Currently displaying revision d15214ccc7426759737adb28bd5ec471 , Show latest

From 26aaa0f97e45025c48139bd39adc8808f9b4e697 Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jirislaby@gmail.com>
Date: Thu, 17 Feb 2011 21:26:57 +0100
Subject: [PATCH] collections: fix a LIST memory leak

When using antlr3 lists, Valgrind reports leaks like this:
==30092== HEAP SUMMARY:
==30092==     in use at exit: 80 bytes in 2 blocks
==30092==   total heap usage: 286 allocs, 284 frees, 1,781,381 bytes allocated
==30092==
==30092== 40 bytes in 1 blocks are definitely lost in loss record 1 of 2
==30092==    at 0x4C2659D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==30092==    by 0x4E333B8: antlr3HashPutI (antlr3collections.c:569)

It's because we use HASH as a representation for LIST. The LIST
abstracts from HASH, so a user doesn't see a hash 'entry' itself.
Hence if the user do list->remove, the HASH returns an 'entry' to us
and we return entry->data to the user. But nobody frees the entry
itself.

So free the entry from now on.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
---
 src/antlr3collections.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/antlr3collections.c b/src/antlr3collections.c
index 48ffe18..01f3f7e 100644
--- a/src/antlr3collections.c
+++ b/src/antlr3collections.c
@@ -946,7 +946,9 @@ antlr3ListRemove	    (pANTLR3_LIST list, ANTLR3_INTKEY key)
 
     if	(entry != NULL)
     {
-        return  entry->data;
+	void *data = entry->data;
+	ANTLR3_FREE(entry);
+        return  data;
     }
     else
     {
-- 
1.7.3.4

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File fix-LIST-memory-leak.patch of Package libantlr3c2 (Revision d15214ccc7426759737adb28bd5ec471)

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