path: root/security
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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-02-27 22:05:54 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-02-27 13:37:48 -0500
commit591ad7feaec5417681b4112f8df52fc43bb7c92e (patch)
tree0555df9d98236f6a63ca109632a277c4458842e3 /security
parentSUNRPC: check RPC inode's pipe reference before dereferencing (diff)
SUNRPC: move waitq from RPC pipe to RPC inode
Currently, wait queue, used for polling of RPC pipe changes from user-space, is a part of RPC pipe. But the pipe data itself can be released on NFS umount prior to dentry-inode pair, connected to it (is case of this pair is open by some process). This is not a problem for almost all pipe users, because all PipeFS file operations checks pipe reference prior to using it. Except evenfd. This thing registers itself with "poll" file operation and thus has a reference to pipe wait queue. This leads to oopses on destroying eventfd after NFS umount (like rpc_idmapd do) since not pipe data left to the point already. The solution is to wait queue from pipe data to internal RPC inode data. This looks more logical, because this wiat queue used only for user-space processes, which already holds inode reference. Note: upcalls have to get pipe->dentry prior to dereferecing wait queue to make sure, that mount point won't disappear from underneath us. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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