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authorAl Viro <viro@ZenIV.linux.org.uk>2011-09-14 18:55:41 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-09-14 11:31:55 -0700
commit1d2ef5901483004d74947bbf78d5146c24038fe7 (patch)
treeadd2cc75116bf7588434f212bb8dd52d32b320d5 /fs/namei.c
parent003f6c9df54970d8b19578d195b3e2b398cdbde2 (diff)
downloadlinux-1d2ef5901483004d74947bbf78d5146c24038fe7.tar.bz2
restore pinning the victim dentry in vfs_rmdir()/vfs_rename_dir()
We used to get the victim pinned by dentry_unhash() prior to commit 64252c75a219 ("vfs: remove dget() from dentry_unhash()") and ->rmdir() and ->rename() instances relied on that; most of them don't care, but ones that used d_delete() themselves do. As the result, we are getting rmdir() oopses on NFS now. Just grab the reference before locking the victim and drop it explicitly after unlocking, same as vfs_rename_other() does. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Simon Kirby <sim@hostway.ca> Cc: stable@kernel.org (3.0.x) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index b52bc685465f..f4788365ea22 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2616,6 +2616,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
if (!dir->i_op->rmdir)
return -EPERM;
+ dget(dentry);
mutex_lock(&dentry->d_inode->i_mutex);
error = -EBUSY;
@@ -2636,6 +2637,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
out:
mutex_unlock(&dentry->d_inode->i_mutex);
+ dput(dentry);
if (!error)
d_delete(dentry);
return error;
@@ -3025,6 +3027,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
if (error)
return error;
+ dget(new_dentry);
if (target)
mutex_lock(&target->i_mutex);
@@ -3045,6 +3048,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
out:
if (target)
mutex_unlock(&target->i_mutex);
+ dput(new_dentry);
if (!error)
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
d_move(old_dentry,new_dentry);