* [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id
@ 2017-03-10 19:15 Olga Kornievskaia
2017-03-10 20:51 ` Trond Myklebust
0 siblings, 1 reply; 6+ messages in thread
From: Olga Kornievskaia @ 2017-03-10 19:15 UTC (permalink / raw)
To: Trond.Myklebust, anna.schumaker; +Cc: linux-nfs
Since rpc_task is async, the release function should be called which
will free the impl_id, scope, and owner.
Fixes: 8d89bd70bc9 ("NFS setup async exchange_id")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
fs/nfs/nfs4proc.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 59be0f7..b77cb6f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7537,10 +7537,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
task_setup_data.callback_data = calldata;
task = rpc_run_task(&task_setup_data);
- if (IS_ERR(task)) {
- status = PTR_ERR(task);
- goto out_impl_id;
- }
+ if (IS_ERR(task))
+ return PTR_ERR(task);
if (!xprt) {
status = rpc_wait_for_completion_task(task);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id
2017-03-10 19:15 [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id Olga Kornievskaia
@ 2017-03-10 20:51 ` Trond Myklebust
2017-03-10 21:35 ` Olga Kornievskaia
0 siblings, 1 reply; 6+ messages in thread
From: Trond Myklebust @ 2017-03-10 20:51 UTC (permalink / raw)
To: anna.schumaker@netapp.com, kolga@netapp.com; +Cc: linux-nfs@vger.kernel.org
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id
2017-03-10 20:51 ` Trond Myklebust
@ 2017-03-10 21:35 ` Olga Kornievskaia
2017-03-10 21:56 ` Olga Kornievskaia
0 siblings, 1 reply; 6+ messages in thread
From: Olga Kornievskaia @ 2017-03-10 21:35 UTC (permalink / raw)
To: Trond.Myklebust, anna.schumaker; +Cc: linux-nfs
Since rpc_task is async, the release function should be called which
will free the impl_id, scope, and owner.
Trond pointed at 2 more problems:
-- use of client pointer after free in the nfs4_exchangeid_release() function
-- cl_count mismatch if rpc_run_task() isn't run
Fixes: 8d89bd70bc9 ("NFS setup async exchange_id")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
fs/nfs/nfs4proc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 59be0f7..3a79d3a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7426,11 +7426,11 @@ static void nfs4_exchange_id_release(void *data)
struct nfs41_exchange_id_data *cdata =
(struct nfs41_exchange_id_data *)data;
- nfs_put_client(cdata->args.client);
if (cdata->xprt) {
xprt_put(cdata->xprt);
rpc_clnt_xprt_switch_put(cdata->args.client->cl_rpcclient);
}
+ nfs_put_client(cdata->args.client);
kfree(cdata->res.impl_id);
kfree(cdata->res.server_scope);
kfree(cdata->res.server_owner);
@@ -7537,10 +7537,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
task_setup_data.callback_data = calldata;
task = rpc_run_task(&task_setup_data);
- if (IS_ERR(task)) {
- status = PTR_ERR(task);
- goto out_impl_id;
- }
+ if (IS_ERR(task))
+ return PTR_ERR(task);
if (!xprt) {
status = rpc_wait_for_completion_task(task);
@@ -7558,6 +7556,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
clp->cl_implid->date.seconds,
clp->cl_implid->date.nseconds);
dprintk("NFS reply exchange_id: %d\n", status);
+ if (status)
+ nfs_put_client(clp);
return status;
out_impl_id:
--
1.8.3.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id
2017-03-10 21:35 ` Olga Kornievskaia
@ 2017-03-10 21:56 ` Olga Kornievskaia
2017-03-11 15:49 ` Trond Myklebust
0 siblings, 1 reply; 6+ messages in thread
From: Olga Kornievskaia @ 2017-03-10 21:56 UTC (permalink / raw)
To: Olga Kornievskaia; +Cc: Trond Myklebust, Anna Schumaker, linux-nfs
On Fri, Mar 10, 2017 at 4:35 PM, Olga Kornievskaia <kolga@netapp.com> wrote:
> Since rpc_task is async, the release function should be called which
> will free the impl_id, scope, and owner.
>
> Trond pointed at 2 more problems:
> -- use of client pointer after free in the nfs4_exchangeid_release() function
> -- cl_count mismatch if rpc_run_task() isn't run
>
> Fixes: 8d89bd70bc9 ("NFS setup async exchange_id")
> Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
> ---
> fs/nfs/nfs4proc.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 59be0f7..3a79d3a 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -7426,11 +7426,11 @@ static void nfs4_exchange_id_release(void *data)
> struct nfs41_exchange_id_data *cdata =
> (struct nfs41_exchange_id_data *)data;
>
> - nfs_put_client(cdata->args.client);
> if (cdata->xprt) {
> xprt_put(cdata->xprt);
> rpc_clnt_xprt_switch_put(cdata->args.client->cl_rpcclient);
> }
> + nfs_put_client(cdata->args.client);
> kfree(cdata->res.impl_id);
> kfree(cdata->res.server_scope);
> kfree(cdata->res.server_owner);
> @@ -7537,10 +7537,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
> task_setup_data.callback_data = calldata;
>
> task = rpc_run_task(&task_setup_data);
> - if (IS_ERR(task)) {
> - status = PTR_ERR(task);
> - goto out_impl_id;
> - }
> + if (IS_ERR(task))
> + return PTR_ERR(task);
>
> if (!xprt) {
> status = rpc_wait_for_completion_task(task);
> @@ -7558,6 +7556,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
> clp->cl_implid->date.seconds,
> clp->cl_implid->date.nseconds);
> dprintk("NFS reply exchange_id: %d\n", status);
> + if (status)
> + nfs_put_client(clp);
> return status;
>
> out_impl_id:
Urgh. scratch this one, it's causing problems. Will try again.
> --
> 1.8.3.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id
2017-03-10 21:56 ` Olga Kornievskaia
@ 2017-03-11 15:49 ` Trond Myklebust
2017-03-13 14:36 ` [PATCH v2 " Olga Kornievskaia
0 siblings, 1 reply; 6+ messages in thread
From: Trond Myklebust @ 2017-03-11 15:49 UTC (permalink / raw)
To: aglo@umich.edu, kolga@netapp.com
Cc: anna.schumaker@netapp.com, linux-nfs@vger.kernel.org
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2 1/1] NFS prevent double free in async nfs4_exchange_id
2017-03-11 15:49 ` Trond Myklebust
@ 2017-03-13 14:36 ` Olga Kornievskaia
0 siblings, 0 replies; 6+ messages in thread
From: Olga Kornievskaia @ 2017-03-13 14:36 UTC (permalink / raw)
To: Trond.Myklebust, anna.schumaker; +Cc: linux-nfs
Since rpc_task is async, the release function should be called which
will free the impl_id, scope, and owner.
Trond pointed at 2 more problems:
-- use of client pointer after free in the nfs4_exchangeid_release() function
-- cl_count mismatch if rpc_run_task() isn't run
Fixes: 8d89bd70bc9 ("NFS setup async exchange_id")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
fs/nfs/nfs4proc.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 59be0f7..1a65af2 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7426,11 +7426,11 @@ static void nfs4_exchange_id_release(void *data)
struct nfs41_exchange_id_data *cdata =
(struct nfs41_exchange_id_data *)data;
- nfs_put_client(cdata->args.client);
if (cdata->xprt) {
xprt_put(cdata->xprt);
rpc_clnt_xprt_switch_put(cdata->args.client->cl_rpcclient);
}
+ nfs_put_client(cdata->args.client);
kfree(cdata->res.impl_id);
kfree(cdata->res.server_scope);
kfree(cdata->res.server_owner);
@@ -7537,10 +7537,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
task_setup_data.callback_data = calldata;
task = rpc_run_task(&task_setup_data);
- if (IS_ERR(task)) {
- status = PTR_ERR(task);
- goto out_impl_id;
- }
+ if (IS_ERR(task))
+ return PTR_ERR(task);
if (!xprt) {
status = rpc_wait_for_completion_task(task);
@@ -7568,6 +7566,7 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
kfree(calldata->res.server_owner);
out_calldata:
kfree(calldata);
+ nfs_put_client(clp);
goto out;
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-03-13 14:36 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-03-10 19:15 [PATCH 1/1] NFS prevent double free in async nfs4_exchange_id Olga Kornievskaia
2017-03-10 20:51 ` Trond Myklebust
2017-03-10 21:35 ` Olga Kornievskaia
2017-03-10 21:56 ` Olga Kornievskaia
2017-03-11 15:49 ` Trond Myklebust
2017-03-13 14:36 ` [PATCH v2 " Olga Kornievskaia
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