fs: Fix uninitialized value issue in from_kuid and from_kgid

[ Upstream commit 15f34347481648a567db67fb473c23befb796af5 ]

ocfs2_setattr() uses attr->ia_mode, attr->ia_uid and attr->ia_gid in
a trace point even though ATTR_MODE, ATTR_UID and ATTR_GID aren't set.

Initialize all fields of newattrs to avoid uninitialized variables, by
checking if ATTR_MODE, ATTR_UID, ATTR_GID are initialized, otherwise 0.

Reported-by:  <syzbot+6c55f725d1bdc8c52058@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=6c55f725d1bdc8c52058


Signed-off-by: Alessandro Zanni <alessandro.zanni87@gmail.com>
Link: https://lore.kernel.org/r/20241017120553.55331-1-alessandro.zanni87@gmail.com


Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>