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[ Upstream commit b835a71ef64a61383c414d6bf2896d2c0161deca ] Syzbot reports an use-after-free in workqueue context: BUG: KASAN: use-after-free in mutex_unlock+0x19/0x40 kernel/locking/mutex.c:737 mutex_unlock+0x19/0x40 kernel/locking/mutex.c:737 __smsc95xx_mdio_read drivers/net/usb/smsc95xx.c:217 [inline] smsc95xx_mdio_read+0x583/0x870 drivers/net/usb/smsc95xx.c:278 check_carrier+0xd1/0x2e0 drivers/net/usb/smsc95xx.c:644 process_one_work+0x777/0xf90 kernel/workqueue.c:2274 worker_thread+0xa8f/0x1430 kernel/workqueue.c:2420 kthread+0x2df/0x300 kernel/kthread.c:255 It looks like that smsc95xx_unbind() is freeing the structures that are still in use by the concurrently running workqueue callback. Thus switch to using cancel_delayed_work_sync() to ensure the work callback really is no longer active. Reported-by: syzbot+29dc7d4ae19b703ff947@syzkaller.appspotmail.com Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.