From: Sebastian Harl <sh@tokkee.org>
Date: Wed, 8 Jul 2009 11:19:57 +0000 (+0200)
Subject: src/utils_cache.c: Make really sure to free the right cache entry.
X-Git-Tag: collectd-4.6.5~29^2~1
X-Git-Url: https://git.tokkee.org/?p=collectd.git;a=commitdiff_plain;h=c2593281c3ed2919f67514381be2b5137308f3af

src/utils_cache.c: Make really sure to free the right cache entry.

Make sure we do not try to free a (possibly some random) cache entry after
removing it from the AVL tree. Potentially, this might have caused invalid
free()s in some rare situations.
---

diff --git a/src/utils_cache.c b/src/utils_cache.c
index 60d32832..33dc6b15 100644
--- a/src/utils_cache.c
+++ b/src/utils_cache.c
@@ -296,6 +296,7 @@ int uc_check_timeout (void)
     {
       DEBUG ("uc_check_timeout: %s is missing but ``uninteresting''",
 	  keys[i]);
+      ce = NULL;
       status = c_avl_remove (cache_tree, keys[i],
 	  (void *) &key, (void *) &ce);
       if (status != 0)
@@ -304,7 +305,8 @@ int uc_check_timeout (void)
       }
       sfree (keys[i]);
       sfree (key);
-      cache_free (ce);
+      if (ce != NULL)
+        cache_free (ce);
       continue;
     }