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H A D | super.c | 08a28272 Sun Oct 29 16:10:06 CDT 2023 Juntong Deng <juntong.deng@outlook.com> gfs2: Fix slab-use-after-free in gfs2_qd_dealloc
[ Upstream commit bdcb8aa434c6d36b5c215d02a9ef07551be25a37 ]
In gfs2_put_super(), whether withdrawn or not, the quota should be cleaned up by gfs2_quota_cleanup().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@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=29c47e9e51895928698c Signed-off-by: Juntong Deng <juntong.deng@outlook.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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