From: Juntong Deng <juntong.deng@xxxxxxxxxxx> commit bdcb8aa434c6d36b5c215d02a9ef07551be25a37 upstream. In gfs2_put_super(), whether withdrawn or not, the quota should be cleaned up by gfs2_quota_cleanup(). Otherwise, struct gfs2_sbd will be freed before gfs2_qd_dealloc (rcu callback) has run for all gfs2_quota_data objects, resulting in use-after-free. Also, gfs2_destroy_threads() and gfs2_quota_cleanup() is already called by gfs2_make_fs_ro(), so in gfs2_put_super(), after calling gfs2_make_fs_ro(), there is no need to call them again. Reported-by: syzbot+29c47e9e51895928698c@xxxxxxxxxxxxxxxxxxxxxxxxx Closes: https://syzkaller.appspot.com/bug?extid=29c47e9e51895928698c Signed-off-by: Juntong Deng <juntong.deng@xxxxxxxxxxx> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Clayton Casciato <majortomtosourcecontrol@xxxxxxxxx> --- fs/gfs2/super.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -591,6 +591,8 @@ restart: if (!sb_rdonly(sb)) { gfs2_make_fs_ro(sdp); + } else { + gfs2_quota_cleanup(sdp); } WARN_ON(gfs2_withdrawing(sdp)); Patches currently in stable-queue which might be from juntong.deng@xxxxxxxxxxx are queue-6.1/gfs2-fix-slab-use-after-free-in-gfs2_qd_dealloc.patch
