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authorLinus Torvalds <torvalds@linux-foundation.org>2020-01-23 11:21:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-23 11:21:35 -0800
commitfa0a4e3b541257da515def87b84529b3bfd08119 (patch)
tree8b6808a5b1019761beaccd5ddf080ff18963b614 /fs
parent3a83c8c81c91fe10e7002c2c0e74b23e80f41f28 (diff)
parent9c1c2b35f1d94de8325344c2777d7ee67492db3b (diff)
Merge tag 'ceph-for-5.5-rc8' of https://github.com/ceph/ceph-client
Pull ceph fix from Ilya Dryomov: "A fix for a potential use-after-free from Jeff, marked for stable" * tag 'ceph-for-5.5-rc8' of https://github.com/ceph/ceph-client: ceph: hold extra reference to r_parent over life of request
Diffstat (limited to 'fs')
-rw-r--r--fs/ceph/mds_client.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 374db1bd57d1..145d46ba25ae 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -708,8 +708,10 @@ void ceph_mdsc_release_request(struct kref *kref)
/* avoid calling iput_final() in mds dispatch threads */
ceph_async_iput(req->r_inode);
}
- if (req->r_parent)
+ if (req->r_parent) {
ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
+ ceph_async_iput(req->r_parent);
+ }
ceph_async_iput(req->r_target_inode);
if (req->r_dentry)
dput(req->r_dentry);
@@ -2676,8 +2678,10 @@ int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
/* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
if (req->r_inode)
ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
- if (req->r_parent)
+ if (req->r_parent) {
ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
+ ihold(req->r_parent);
+ }
if (req->r_old_dentry_dir)
ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
CEPH_CAP_PIN);