If the rpc_pipefs is unmounted, then the rpc_pipe->dentry becomes NULL
and dereferencing the dentry->d_sb will trigger an oops. The only
reason we're doing that is to determine the nfsd_net, which could
instead be passed in by the caller. So do that instead.
Signed-off-by: Scott Mayhew <smayhew@xxxxxxxxxx>
---
fs/nfsd/nfs4recover.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 9e40dfecf1b1..186fa2c2c6ba 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -747,13 +747,11 @@ struct cld_upcall {
};
static int
-__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
+__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn)
{
int ret;
struct rpc_pipe_msg msg;
struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u);
- struct nfsd_net *nn = net_generic(pipe->dentry->d_sb->s_fs_info,
- nfsd_net_id);
memset(&msg, 0, sizeof(msg));
msg.data = cmsg;
@@ -773,7 +771,7 @@ __cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
}
static int
-cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
+cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn)
{
int ret;
@@ -782,7 +780,7 @@ cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg)
* upcalls queued.
*/
do {
- ret = __cld_pipe_upcall(pipe, cmsg);
+ ret = __cld_pipe_upcall(pipe, cmsg, nn);
} while (ret == -EAGAIN);
return ret;
@@ -1115,7 +1113,7 @@ nfsd4_cld_create(struct nfs4_client *clp)
memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
clp->cl_name.len);
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret) {
ret = cup->cu_u.cu_msg.cm_status;
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
@@ -1180,7 +1178,7 @@ nfsd4_cld_create_v2(struct nfs4_client *clp)
} else
cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0;
- ret = cld_pipe_upcall(cn->cn_pipe, cmsg);
+ ret = cld_pipe_upcall(cn->cn_pipe, cmsg, nn);
if (!ret) {
ret = cmsg->cm_status;
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
@@ -1218,7 +1216,7 @@ nfsd4_cld_remove(struct nfs4_client *clp)
memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
clp->cl_name.len);
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret) {
ret = cup->cu_u.cu_msg.cm_status;
clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
@@ -1261,7 +1259,7 @@ nfsd4_cld_check_v0(struct nfs4_client *clp)
memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
clp->cl_name.len);
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret) {
ret = cup->cu_u.cu_msg.cm_status;
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
@@ -1404,7 +1402,7 @@ nfsd4_cld_grace_start(struct nfsd_net *nn)
}
cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart;
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret)
ret = cup->cu_u.cu_msg.cm_status;
@@ -1432,7 +1430,7 @@ nfsd4_cld_grace_done_v0(struct nfsd_net *nn)
cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
cup->cu_u.cu_msg.cm_u.cm_gracetime = nn->boot_time;
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret)
ret = cup->cu_u.cu_msg.cm_status;
@@ -1460,7 +1458,7 @@ nfsd4_cld_grace_done(struct nfsd_net *nn)
}
cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone;
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret)
ret = cup->cu_u.cu_msg.cm_status;
@@ -1524,7 +1522,7 @@ nfsd4_cld_get_version(struct nfsd_net *nn)
goto out_err;
}
cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion;
- ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg);
+ ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn);
if (!ret) {
ret = cup->cu_u.cu_msg.cm_status;
if (ret)
--
2.25.4
