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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/dir.c | |
| parent | 48d0cbd1242aac969560ef8b90f26ee3b09a6a5c (diff) | |
| download | kernel-common-5f21c96dd5c615341963036ae8f5e4f5227a818d.tar.gz kernel-common-5f21c96dd5c615341963036ae8f5e4f5227a818d.tar.bz2 kernel-common-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/dir.c')
| -rw-r--r-- | fs/ceph/dir.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 883c9546111d..ed296ec121d1 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -71,6 +71,21 @@ out_unlock: return 0; } +struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) +{ + struct inode *inode = NULL; + + if (!dentry) + return NULL; + + spin_lock(&dentry->d_lock); + if (dentry->d_parent) { + inode = dentry->d_parent->d_inode; + ihold(inode); + } + spin_unlock(&dentry->d_lock); + return inode; +} /* |