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-rw-r--r--fs/namespace.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index ffa3843..8174c8a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1136,8 +1136,15 @@ SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
{
struct path path;
int retval;
+ int lookup_flags = 0;
- retval = user_path(name, &path);
+ if (flags & ~(MNT_FORCE | MNT_DETACH | MNT_EXPIRE | UMOUNT_NOFOLLOW))
+ return -EINVAL;
+
+ if (!(flags & UMOUNT_NOFOLLOW))
+ lookup_flags |= LOOKUP_FOLLOW;
+
+ retval = user_path_at(AT_FDCWD, name, lookup_flags, &path);
if (retval)
goto out;
retval = -EINVAL;
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