From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Dmitry Vyukov <dvyukov@google.com>,
syzbot <syzbot+e017e49c39ab484ac87a@syzkaller.appspotmail.com>,
Al Viro <viro@zeniv.linux.org.uk>,
io-uring@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
Thomas Gleixner <tglx@linutronix.de>,
tony.luck@intel.com, the arch/x86 maintainers <x86@kernel.org>
Subject: Re: KASAN: use-after-free Read in percpu_ref_switch_to_atomic_rcu
Date: Fri, 6 Mar 2020 17:35:52 +0300 [thread overview]
Message-ID: <20200306143552.GC19839@kadam> (raw)
In-Reply-To: <3f805e51-1db7-3e57-c9a3-15a20699ea54@kernel.dk>
There a bunch of similar bugs. It's seems a common anti-pattern.
block/blk-cgroup.c:85 blkg_free() warn: freeing 'blkg' which has percpu_ref_exit()
block/blk-core.c:558 blk_alloc_queue_node() warn: freeing 'q' which has percpu_ref_exit()
drivers/md/md.c:5528 md_free() warn: freeing 'mddev' which has percpu_ref_exit()
drivers/target/target_core_transport.c:583 transport_free_session() warn: freeing 'se_sess' which has percpu_ref_exit()
fs/aio.c:592 free_ioctx() warn: freeing 'ctx' which has percpu_ref_exit()
fs/aio.c:806 ioctx_alloc() warn: freeing 'ctx' which has percpu_ref_exit()
fs/io_uring.c:6115 io_sqe_files_unregister() warn: freeing 'data' which has percpu_ref_exit()
fs/io_uring.c:6431 io_sqe_files_register() warn: freeing 'ctx->file_data' which has percpu_ref_exit()
fs/io_uring.c:7134 io_ring_ctx_free() warn: freeing 'ctx' which has percpu_ref_exit()
kernel/cgroup/cgroup.c:4948 css_free_rwork_fn() warn: freeing 'css' which has percpu_ref_exit()
mm/backing-dev.c:615 cgwb_create() warn: freeing 'wb' which has percpu_ref_exit()
regards,
dan carpenter
next prev parent reply other threads:[~2020-03-06 14:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-07 8:14 KASAN: use-after-free Read in percpu_ref_switch_to_atomic_rcu syzbot
2020-03-04 7:59 ` Dmitry Vyukov
2020-03-04 14:40 ` Jens Axboe
2020-03-06 14:35 ` Dan Carpenter [this message]
2020-03-06 14:57 ` Jens Axboe
2020-03-06 14:57 ` Jann Horn
2020-03-06 15:34 ` Jens Axboe
2020-03-06 15:36 ` Jann Horn
2020-03-06 16:44 ` Paul E. McKenney
2020-03-06 17:00 ` Jens Axboe
2020-03-06 17:08 ` Jens Axboe
2020-03-06 17:19 ` Paul E. McKenney
2020-03-06 17:21 ` Jens Axboe
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