diff options
author | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-08-01 16:02:47 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-11 08:49:28 -0700 |
commit | f7d3e54fb40cfc6f829b8f8ad3aab026714f2ffc (patch) | |
tree | f82f5275203cf3a98c6ba25a774ceb46b6e3b266 /fs/nfs/nfs4proc.c | |
parent | f5214eb4baf87b0134acf98c29150071fa3b815c (diff) |
NFSv4: Fix EXCHANGE_ID corrupt verifier issue
commit fd40559c8657418385e42f797e0b04bfc0add748 upstream.
The verifier is allocated on the stack, but the EXCHANGE_ID RPC call was
changed to be asynchronous by commit 8d89bd70bc939. If we interrrupt
the call to rpc_wait_for_completion_task(), we can therefore end up
transmitting random stack contents in lieu of the verifier.
Fixes: 8d89bd70bc939 ("NFS setup async exchange_id")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/nfs/nfs4proc.c')
-rw-r--r-- | fs/nfs/nfs4proc.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 46ca7881d80d..a53b8e0c896a 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -7410,7 +7410,7 @@ static void nfs4_exchange_id_done(struct rpc_task *task, void *data) cdata->res.server_scope = NULL; } /* Save the EXCHANGE_ID verifier session trunk tests */ - memcpy(clp->cl_confirm.data, cdata->args.verifier->data, + memcpy(clp->cl_confirm.data, cdata->args.verifier.data, sizeof(clp->cl_confirm.data)); } out: @@ -7447,7 +7447,6 @@ static const struct rpc_call_ops nfs4_exchange_id_call_ops = { static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, u32 sp4_how, struct rpc_xprt *xprt) { - nfs4_verifier verifier; struct rpc_message msg = { .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], .rpc_cred = cred, @@ -7470,8 +7469,7 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, if (!calldata) goto out; - if (!xprt) - nfs4_init_boot_verifier(clp, &verifier); + nfs4_init_boot_verifier(clp, &calldata->args.verifier); status = nfs4_init_uniform_client_string(clp); if (status) @@ -7516,9 +7514,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred, task_setup_data.rpc_xprt = xprt; task_setup_data.flags = RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC; - calldata->args.verifier = &clp->cl_confirm; - } else { - calldata->args.verifier = &verifier; + memcpy(calldata->args.verifier.data, clp->cl_confirm.data, + sizeof(calldata->args.verifier.data)); } calldata->args.client = clp; #ifdef CONFIG_NFS_V4_1_MIGRATION |