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RPCSEC_GSS: Fix an Oopsable condition when creating/destroying pipefs objects 

If an error condition occurs on rpc_pipefs creation, or the user mounts
rpc_pipefs and then unmounts it, then the dentries in struct gss_auth
need to be reset to NULL so that a second call to gss_pipes_dentries_destroy
doesn't try to free them again.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-08-26 16:05:11 -04:00
parent e726340ac9
commit 6b2fddd3e7
1 changed files with 20 additions and 12 deletions
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32
net/sunrpc/auth_gss/auth_gss.c
View File

@ -796,10 +796,14 @@ static void gss_pipes_dentries_destroy(struct rpc_auth *auth)
struct gss_auth *gss_auth;
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
if (gss_auth->pipe[0]->dentry)
if (gss_auth->pipe[0]->dentry) {
rpc_unlink(gss_auth->pipe[0]->dentry);
if (gss_auth->pipe[1]->dentry)
gss_auth->pipe[0]->dentry = NULL;
}
if (gss_auth->pipe[1]->dentry) {
rpc_unlink(gss_auth->pipe[1]->dentry);
gss_auth->pipe[1]->dentry = NULL;
}
}
static int gss_pipes_dentries_create(struct rpc_auth *auth)
@ -807,26 +811,30 @@ static int gss_pipes_dentries_create(struct rpc_auth *auth)
int err;
struct gss_auth *gss_auth;
struct rpc_clnt *clnt;
struct dentry *dentry;
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
clnt = gss_auth->client;
gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
"gssd",
clnt, gss_auth->pipe[1]);
if (IS_ERR(gss_auth->pipe[1]->dentry))
return PTR_ERR(gss_auth->pipe[1]->dentry);
gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
gss_auth->mech->gm_name,
clnt, gss_auth->pipe[0]);
if (IS_ERR(gss_auth->pipe[0]->dentry)) {
err = PTR_ERR(gss_auth->pipe[0]->dentry);
dentry = rpc_mkpipe_dentry(clnt->cl_dentry, "gssd",
clnt, gss_auth->pipe[1]);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
goto err;
}
gss_auth->pipe[1]->dentry = dentry;
dentry = rpc_mkpipe_dentry(clnt->cl_dentry, gss_auth->mech->gm_name,
clnt, gss_auth->pipe[0]);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
goto err_unlink_pipe_1;
}
return 0;
err_unlink_pipe_1:
rpc_unlink(gss_auth->pipe[1]->dentry);
gss_auth->pipe[1]->dentry = NULL;
err:
return err;
}