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authorYing Xue <ying.xue@windriver.com>2015-03-26 13:10:24 +0300
committerDavid S. Miller <davem@davemloft.net>2015-03-29 22:40:28 +0300
commit8a0f6ebe8494c5c6ccfe12264385b64c280e3241 (patch)
tree2f106a95ffda73b8e8f1596cc95152398cd5379b /fs/afs/afs_vl.h
parentb952b2befb6f6b009e91f087285b9a0a6beb1cc8 (diff)
downloadlinux-8a0f6ebe8494c5c6ccfe12264385b64c280e3241.tar.xz
tipc: involve reference counter for node structure
TIPC node hash node table is protected with rcu lock on read side. tipc_node_find() is used to look for a node object with node address through iterating the hash node table. As the entire process of what tipc_node_find() traverses the table is guarded with rcu read lock, it's safe for us. However, when callers use the node object returned by tipc_node_find(), there is no rcu read lock applied. Therefore, this is absolutely unsafe for callers of tipc_node_find(). Now we introduce a reference counter for node structure. Before tipc_node_find() returns node object to its caller, it first increases the reference counter. Accordingly, after its caller used it up, it decreases the counter again. This can prevent a node being used by one thread from being freed by another thread. Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericson.com> Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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