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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-01-07 02:24:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-01 19:27:08 +0300 |
| commit | 4c36ca387af4a9b5d775e46a6cb9dc2d151bf057 (patch) | |
| tree | 35d1f6833302f70a183e69075bfa838e7a50cf1b /fs/nfs | |
| parent | 72edb228b420efa70ced62593ca05b92c6496b2c (diff) | |
| download | linux-4c36ca387af4a9b5d775e46a6cb9dc2d151bf057.tar.xz | |
NFSv4: Handle case where the lookup of a directory fails
commit ac795161c93699d600db16c1a8cc23a65a1eceaf upstream.
If the application sets the O_DIRECTORY flag, and tries to open a
regular file, nfs_atomic_open() will punt to doing a regular lookup.
If the server then returns a regular file, we will happily return a
file descriptor with uninitialised open state.
The fix is to return the expected ENOTDIR error in these cases.
Reported-by: Lyu Tao <tao.lyu@epfl.ch>
Fixes: 0dd2b474d0b6 ("nfs: implement i_op->atomic_open()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/dir.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 5b68c44848ca..a78162238988 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1982,6 +1982,19 @@ out: no_open: res = nfs_lookup(dir, dentry, lookup_flags); + if (!res) { + inode = d_inode(dentry); + if ((lookup_flags & LOOKUP_DIRECTORY) && inode && + !S_ISDIR(inode->i_mode)) + res = ERR_PTR(-ENOTDIR); + } else if (!IS_ERR(res)) { + inode = d_inode(res); + if ((lookup_flags & LOOKUP_DIRECTORY) && inode && + !S_ISDIR(inode->i_mode)) { + dput(res); + res = ERR_PTR(-ENOTDIR); + } + } if (switched) { d_lookup_done(dentry); if (!res) |