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NFS client bugfixes for Linux 3.9

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- Stable fix for memory corruption issues in nfs4[01]_walk_client_list
 - Stable fix for an Oopsable bug in rpc_clone_client
 - Another state manager deadlock in the NFSv4 open code
 - Memory leaks in nfs4_discover_server_trunking and rpc_new_client
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Merge tag 'nfs-for-3.9-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 - fix for memory corruption issues in nfs4[01]_walk_client_list (stable)
 - fix for an Oopsable bug in rpc_clone_client (stable)
 - another state manager deadlock in the NFSv4 open code
 - memory leaks in nfs4_discover_server_trunking and rpc_new_client

* tag 'nfs-for-3.9-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4: Fix another potential state manager deadlock
  SUNRPC: Fix a potential memory leak in rpc_new_client
  NFSv4/4.1: Fix bugs in nfs4[01]_walk_client_list
  NFSv4: Fix a memory leak in nfs4_discover_server_trunking
  SUNRPC: Remove extra xprt_put()
This commit is contained in:
Linus Torvalds 2013-04-10 09:00:51 -07:00
commit f94eeb423b
4 changed files with 39 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
fs/nfs/nfs4client.c
View File

@ -300,7 +300,7 @@ int nfs40_walk_client_list(struct nfs_client *new,
struct rpc_cred *cred)
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *n, *prev = NULL;
struct nfs_client *pos, *prev = NULL;
struct nfs4_setclientid_res clid = {
.clientid = new->cl_clientid,
.confirm = new->cl_confirm,
@ -308,10 +308,23 @@ int nfs40_walk_client_list(struct nfs_client *new,
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
/* If "pos" isn't marked ready, we can't trust the
* remaining fields in "pos" */
if (pos->cl_cons_state < NFS_CS_READY)
if (pos->cl_cons_state > NFS_CS_READY) {
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
if (prev)
nfs_put_client(prev);
prev = pos;
status = nfs_wait_client_init_complete(pos);
spin_lock(&nn->nfs_client_lock);
if (status < 0)
continue;
}
if (pos->cl_cons_state != NFS_CS_READY)
continue;
if (pos->rpc_ops != new->rpc_ops)
@ -423,16 +436,16 @@ int nfs41_walk_client_list(struct nfs_client *new,
struct rpc_cred *cred)
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *n, *prev = NULL;
struct nfs_client *pos, *prev = NULL;
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
/* If "pos" isn't marked ready, we can't trust the
* remaining fields in "pos", especially the client
* ID and serverowner fields. Wait for CREATE_SESSION
* to finish. */
if (pos->cl_cons_state < NFS_CS_READY) {
if (pos->cl_cons_state > NFS_CS_READY) {
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
@ -440,18 +453,17 @@ int nfs41_walk_client_list(struct nfs_client *new,
nfs_put_client(prev);
prev = pos;
nfs4_schedule_lease_recovery(pos);
status = nfs_wait_client_init_complete(pos);
if (status < 0) {
nfs_put_client(pos);
spin_lock(&nn->nfs_client_lock);
continue;
if (status == 0) {
nfs4_schedule_lease_recovery(pos);
status = nfs4_wait_clnt_recover(pos);
}
status = pos->cl_cons_state;
spin_lock(&nn->nfs_client_lock);
if (status < 0)
continue;
}
if (pos->cl_cons_state != NFS_CS_READY)
continue;
if (pos->rpc_ops != new->rpc_ops)
continue;
@ -469,17 +481,17 @@ int nfs41_walk_client_list(struct nfs_client *new,
continue;
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
*result = pos;
dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
__func__, pos, atomic_read(&pos->cl_count));
*result = pos;
return 0;
break;
}
/* No matching nfs_client found. */
spin_unlock(&nn->nfs_client_lock);
dprintk("NFS: <-- %s status = %d\n", __func__, status);
if (prev)
nfs_put_client(prev);
return status;
}
#endif /* CONFIG_NFS_V4_1 */

1
fs/nfs/nfs4proc.c
View File

@ -1046,6 +1046,7 @@ static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
/* Save the delegation */
nfs4_stateid_copy(&stateid, &delegation->stateid);
rcu_read_unlock();
nfs_release_seqid(opendata->o_arg.seqid);
ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
if (ret != 0)
goto out;

8
fs/nfs/nfs4state.c
View File

@ -1886,7 +1886,13 @@ again:
status = PTR_ERR(clnt);
break;
}
clp->cl_rpcclient = clnt;
/* Note: this is safe because we haven't yet marked the
* client as ready, so we are the only user of
* clp->cl_rpcclient
*/
clnt = xchg(&clp->cl_rpcclient, clnt);
rpc_shutdown_client(clnt);
clnt = clp->cl_rpcclient;
goto again;
case -NFS4ERR_MINOR_VERS_MISMATCH:

11
net/sunrpc/clnt.c
View File

@ -304,10 +304,8 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, stru
err = rpciod_up();
if (err)
goto out_no_rpciod;
err = -EINVAL;
if (!xprt)
goto out_no_xprt;
err = -EINVAL;
if (args->version >= program->nrvers)
goto out_err;
version = program->version[args->version];
@ -382,10 +380,9 @@ out_no_principal:
out_no_stats:
kfree(clnt);
out_err:
xprt_put(xprt);
out_no_xprt:
rpciod_down();
out_no_rpciod:
xprt_put(xprt);
return ERR_PTR(err);
}
@ -512,7 +509,7 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
new = rpc_new_client(args, xprt);
if (IS_ERR(new)) {
err = PTR_ERR(new);
goto out_put;
goto out_err;
}
atomic_inc(&clnt->cl_count);
@ -525,8 +522,6 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
new->cl_chatty = clnt->cl_chatty;
return new;
out_put:
xprt_put(xprt);
out_err:
dprintk("RPC: %s: returned error %d\n", __func__, err);
return ERR_PTR(err);