Flags passed to Q_XQUOTARM were not sanity checked for invalid values.
Fix that.
Fixes: 9da93f9b7cdf ("xfs: fix Q_XQUOTARM ioctl")
Reported-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/xfs/xfs_quotaops.c | 3 +++
1 file changed, 3 insertions(+)
Strictly speaking this may cause user visible regression
(invalid flags are no longer getting ignored) but in this particular
case I think we could get away with it.
diff --git a/fs/xfs/xfs_quotaops.c b/fs/xfs/xfs_quotaops.c
index cd6c7210a373..c7de17deeae6 100644
--- a/fs/xfs/xfs_quotaops.c
+++ b/fs/xfs/xfs_quotaops.c
@@ -201,6 +201,9 @@ xfs_fs_rm_xquota(
if (XFS_IS_QUOTA_ON(mp))
return -EINVAL;
+ if (uflags & ~(FS_USER_QUOTA | FS_GROUP_QUOTA | FS_PROJ_QUOTA))
+ return -EINVAL;
+
if (uflags & FS_USER_QUOTA)
flags |= XFS_DQ_USER;
if (uflags & FS_GROUP_QUOTA)
--
2.16.4
