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| author | Benjamin Coddington <bcodding@redhat.com> | 2017-11-10 06:27:49 -0500 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2017-11-17 16:43:52 -0500 |
| commit | fcfa447062b2061e11f68b846d61cbfe60d0d604 (patch) | |
| tree | ea0a4c4cc3f5edfe9c1bdacebd9d09b379334b4b /fs/nfs/nfs4proc.c | |
| parent | f02fee227e5f21981152850744a6084ff3fa94ee (diff) | |
| download | linux-stable-fcfa447062b2061e11f68b846d61cbfe60d0d604.tar.gz linux-stable-fcfa447062b2061e11f68b846d61cbfe60d0d604.tar.bz2 linux-stable-fcfa447062b2061e11f68b846d61cbfe60d0d604.zip | |
NFS: Revert "NFS: Move the flock open mode check into nfs_flock()"
Commit e12937279c8b "NFS: Move the flock open mode check into nfs_flock()"
changed NFSv3 behavior for flock() such that the open mode must match the
lock type, however that requirement shouldn't be enforced for flock().
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Cc: stable@vger.kernel.org # v4.12
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4proc.c')
| -rw-r--r-- | fs/nfs/nfs4proc.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 6b23a032ee1e..56fa5a16e097 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6709,6 +6709,20 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) return -ENOLCK; + /* + * Don't rely on the VFS having checked the file open mode, + * since it won't do this for flock() locks. + */ + switch (request->fl_type) { + case F_RDLCK: + if (!(filp->f_mode & FMODE_READ)) + return -EBADF; + break; + case F_WRLCK: + if (!(filp->f_mode & FMODE_WRITE)) + return -EBADF; + } + status = nfs4_set_lock_state(state, request); if (status != 0) return status; |