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| author | Sage Weil <sage@newdream.net> | 2011-07-26 11:30:29 -0700 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2011-07-26 11:30:29 -0700 |
| commit | 5f21c96dd5c615341963036ae8f5e4f5227a818d (patch) | |
| tree | 898c5781623b68527427d201e3f975827d08935c /fs/ceph/file.c | |
| parent | 48d0cbd1242aac969560ef8b90f26ee3b09a6a5c (diff) | |
| download | linux-exynos-5f21c96dd5c615341963036ae8f5e4f5227a818d.tar.gz linux-exynos-5f21c96dd5c615341963036ae8f5e4f5227a818d.tar.bz2 linux-exynos-5f21c96dd5c615341963036ae8f5e4f5227a818d.zip | |
ceph: protect access to d_parent
d_parent is protected by d_lock: use it when looking up a dentry's parent
directory inode. Also take a reference and drop it in the caller to avoid
a use-after-free.
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/file.c')
| -rw-r--r-- | fs/ceph/file.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c index f34d47d66e7c..45fbd69daabe 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -122,7 +122,7 @@ int ceph_open(struct inode *inode, struct file *file) struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_mds_request *req; struct ceph_file_info *cf = file->private_data; - struct inode *parent_inode = file->f_dentry->d_parent->d_inode; + struct inode *parent_inode = NULL; int err; int flags, fmode, wanted; @@ -194,8 +194,10 @@ int ceph_open(struct inode *inode, struct file *file) req->r_inode = inode; ihold(inode); req->r_num_caps = 1; - err = ceph_mdsc_do_request(mdsc, (flags & (O_CREAT|O_TRUNC)) ? - parent_inode : NULL, req); + if (flags & (O_CREAT|O_TRUNC)) + parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); + err = ceph_mdsc_do_request(mdsc, parent_inode, req); + iput(parent_inode); if (!err) err = ceph_init_file(inode, file, req->r_fmode); ceph_mdsc_put_request(req); |