xfs: bulletfproof xfs_qm_scall_trunc_qfiles()

[firefly-linux-kernel-4.4.55.git] / fs / xfs / xfs_qm_syscalls.c

diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index 3daf5ea1eb8d73989a4e199aaee4dd2364a98290..f35f13b4ea73f8225415a5601dadd4eb87f71c0b 100644 (file)
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -278,9 +278,10 @@ xfs_qm_scall_trunc_qfiles(
        xfs_mount_t     *mp,
        uint            flags)
 {
-       int             error;
+       int             error = EINVAL;
 
-       if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0) {
+       if (!xfs_sb_version_hasquota(&mp->m_sb) || flags == 0 ||
+           (flags & ~XFS_DQ_ALLTYPES)) {
                xfs_debug(mp, "%s: flags=%x m_qflags=%x",
                        __func__, flags, mp->m_qflags);
                return XFS_ERROR(EINVAL);