4.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Howells <dhowells@xxxxxxxxxx>
commit f25801ee4680ef1db21e15c112e6e5fe3ffe8da5 upstream.
Call ovl_drop_write() earlier in ovl_dentry_open() before we call vfs_open()
as we've done the copy up for which we needed the freeze-write lock by that
point.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: "Kamata, Munehisa" <kamatam@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/overlayfs/inode.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -342,31 +342,25 @@ static int ovl_dentry_open(struct dentry
int err;
struct path realpath;
enum ovl_path_type type;
- bool want_write = false;
type = ovl_path_real(dentry, &realpath);
if (ovl_open_need_copy_up(file->f_flags, type, realpath.dentry)) {
- want_write = true;
err = ovl_want_write(dentry);
if (err)
- goto out;
+ return err;
if (file->f_flags & O_TRUNC)
err = ovl_copy_up_last(dentry, NULL, true);
else
err = ovl_copy_up(dentry);
+ ovl_drop_write(dentry);
if (err)
- goto out_drop_write;
+ return err;
ovl_path_upper(dentry, &realpath);
}
- err = vfs_open(&realpath, file, cred);
-out_drop_write:
- if (want_write)
- ovl_drop_write(dentry);
-out:
- return err;
+ return vfs_open(&realpath, file, cred);
}
static const struct inode_operations ovl_file_inode_operations = {
--
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