[PATCH 5.10 16/86] NFS: Dont allocate nfs_fattr on the stack in __nfs42_ssc_open()

Greg Kroah-Hartman
2022-08-29T11:06:55Z

From: Trond Myklebust <trond.myklebust@hammerspace.com>

[ Upstream commit 156cd28562a4e8ca454d11b234d9f634a45d6390 ]

The preferred behaviour is always to allocate struct nfs_fattr from the
slab.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfs/nfs4file.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 9fdecd9090493..4928eaa0d4c02 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -321,7 +321,7 @@ static int read_name_gen = 1;
static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
struct nfs_fh *src_fh, nfs4_stateid *stateid)
{
- struct nfs_fattr fattr;
+ struct nfs_fattr *fattr = nfs_alloc_fattr();
struct file *filep, *res;
struct nfs_server *server;
struct inode *r_ino = NULL;
@@ -332,9 +332,10 @@ static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,

server = NFS_SERVER(ss_mnt->mnt_root->d_inode);

- nfs_fattr_init(&fattr);
+ if (!fattr)
+ return ERR_PTR(-ENOMEM);

- status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
+ status = nfs4_proc_getattr(server, src_fh, fattr, NULL, NULL);
if (status < 0) {
res = ERR_PTR(status);
goto out;
@@ -347,7 +348,7 @@ static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
goto out;
snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);

- r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
+ r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, fattr,
NULL);
if (IS_ERR(r_ino)) {
res = ERR_CAST(r_ino);
@@ -392,6 +393,7 @@ static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
out_free_name:
kfree(read_name);
out:
+ nfs_free_fattr(fattr);
return res;
out_stateowner:
nfs4_put_state_owner(sp);
--
2.35.1