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nfsd-6.10 fixes:

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- Fix crashes triggered by administrative operations on the server
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Merge tag 'nfsd-6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:

 - Fix crashes triggered by administrative operations on the server

* tag 'nfsd-6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  NFSD: grab nfsd_mutex in nfsd_nl_rpc_status_get_dumpit()
  nfsd: fix oops when reading pool_stats before server is started
This commit is contained in:
Linus Torvalds 2024-06-22 13:55:56 -07:00
commit c2fc946223
5 changed files with 16 additions and 47 deletions
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2
Documentation/netlink/specs/nfsd.yaml
View File

@ -123,8 +123,6 @@ operations:
doc: dump pending nfsd rpc
attribute-set: rpc-status
dump:
pre: nfsd-nl-rpc-status-get-start
post: nfsd-nl-rpc-status-get-done
reply:
attributes:
- xid

2
fs/nfsd/netlink.c
View File

@ -44,9 +44,7 @@ static const struct nla_policy nfsd_listener_set_nl_policy[NFSD_A_SERVER_SOCK_AD
static const struct genl_split_ops nfsd_nl_ops[] = {
{
.cmd = NFSD_CMD_RPC_STATUS_GET,
.start = nfsd_nl_rpc_status_get_start,
.dumpit = nfsd_nl_rpc_status_get_dumpit,
.done = nfsd_nl_rpc_status_get_done,
.flags = GENL_CMD_CAP_DUMP,
},
{

3
fs/nfsd/netlink.h
View File

@ -15,9 +15,6 @@
extern const struct nla_policy nfsd_sock_nl_policy[NFSD_A_SOCK_TRANSPORT_NAME + 1];
extern const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1];
int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb);
int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb);
int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info);

48
fs/nfsd/nfsctl.c
View File

@ -1460,28 +1460,6 @@ static int create_proc_exports_entry(void)
unsigned int nfsd_net_id;
/**
* nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
* @cb: netlink metadata and command arguments
*
* Return values:
* %0: The rpc_status_get command may proceed
* %-ENODEV: There is no NFSD running in this namespace
*/
int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
{
struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id);
int ret = -ENODEV;
mutex_lock(&nfsd_mutex);
if (nn->nfsd_serv)
ret = 0;
else
mutex_unlock(&nfsd_mutex);
return ret;
}
static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
struct netlink_callback *cb,
struct nfsd_genl_rqstp *rqstp)
@ -1558,8 +1536,16 @@ static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
int i, ret, rqstp_index = 0;
struct nfsd_net *nn;
mutex_lock(&nfsd_mutex);
nn = net_generic(sock_net(skb->sk), nfsd_net_id);
if (!nn->nfsd_serv) {
ret = -ENODEV;
goto out_unlock;
}
rcu_read_lock();
@ -1636,22 +1622,10 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
ret = skb->len;
out:
rcu_read_unlock();
return ret;
}
/**
* nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
* @cb: netlink metadata and command arguments
*
* Return values:
* %0: Success
*/
int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
{
out_unlock:
mutex_unlock(&nfsd_mutex);
return 0;
return ret;
}
/**

8
net/sunrpc/svc_xprt.c
View File

@ -1421,12 +1421,13 @@ static void *svc_pool_stats_start(struct seq_file *m, loff_t *pos)
dprintk("svc_pool_stats_start, *pidx=%u\n", pidx);
if (!si->serv)
return NULL;
mutex_lock(si->mutex);
if (!pidx)
return SEQ_START_TOKEN;
if (!si->serv)
return NULL;
return pidx > si->serv->sv_nrpools ? NULL
: &si->serv->sv_pools[pidx - 1];
}
@ -1458,7 +1459,8 @@ static void svc_pool_stats_stop(struct seq_file *m, void *p)
{
struct svc_info *si = m->private;
mutex_unlock(si->mutex);
if (si->serv)
mutex_unlock(si->mutex);
}
static int svc_pool_stats_show(struct seq_file *m, void *p)