File nscd-gc-crash.patch of Package glibc.4524

Overview Repositories Revisions Requests Users Attributes Meta

File nscd-gc-crash.patch of Package glibc.4524

[BZ #19755]
	* nscd/pwdcache.c (cache_addpw): Lock prune_run_lock while adding
	new entries in auto-propagate mode.
	* nscd/grpcache.c (cache_addgr): Likewise.

Index: glibc-2.22/nscd/grpcache.c
===================================================================
--- glibc-2.22.orig/nscd/grpcache.c
+++ glibc-2.22/nscd/grpcache.c
@@ -205,10 +205,19 @@ cache_addgr (struct database_dyn *db, in
       dataset = NULL;
 
       if (he == NULL)
-	dataset = (struct dataset *) mempool_alloc (db, total + n, 1);
+	{
+	  /* Prevent an INVALIDATE request from pruning the data between
+	     the two calls to cache_add.  */
+	  if (db->propagate)
+	    pthread_mutex_lock (&db->prune_run_lock);
+	  dataset = (struct dataset *) mempool_alloc (db, total + n, 1);
+	}
 
       if (dataset == NULL)
 	{
+	  if (he == NULL && db->propagate)
+	    pthread_mutex_unlock (&db->prune_run_lock);
+
 	  /* We cannot permanently add the result in the moment.  But
 	     we can provide the result as is.  Store the data in some
 	     temporary memory.  */
@@ -396,6 +405,8 @@ cache_addgr (struct database_dyn *db, in
 
 	out:
 	  pthread_rwlock_unlock (&db->lock);
+	  if (he == NULL && db->propagate)
+	    pthread_mutex_unlock (&db->prune_run_lock);
 	}
     }
 
Index: glibc-2.22/nscd/pwdcache.c
===================================================================
--- glibc-2.22.orig/nscd/pwdcache.c
+++ glibc-2.22/nscd/pwdcache.c
@@ -198,10 +198,19 @@ cache_addpw (struct database_dyn *db, in
       dataset = NULL;
 
       if (he == NULL)
-	dataset = (struct dataset *) mempool_alloc (db, total + n, 1);
+	{
+	  /* Prevent an INVALIDATE request from pruning the data between
+	     the two calls to cache_add.  */
+	  if (db->propagate)
+	    pthread_mutex_lock (&db->prune_run_lock);
+	  dataset = (struct dataset *) mempool_alloc (db, total + n, 1);
+	}
 
       if (dataset == NULL)
 	{
+	  if (he == NULL && db->propagate)
+	    pthread_mutex_unlock (&db->prune_run_lock);
+
 	  /* We cannot permanently add the result in the moment.  But
 	     we can provide the result as is.  Store the data in some
 	     temporary memory.  */
@@ -374,6 +383,8 @@ cache_addpw (struct database_dyn *db, in
 
 	out:
 	  pthread_rwlock_unlock (&db->lock);
+	  if (he == NULL && db->propagate)
+	    pthread_mutex_unlock (&db->prune_run_lock);
 	}
     }

Places

File nscd-gc-crash.patch of Package glibc.4524

Places