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Date: Wed, 13 May 2015 17:59:51 +0300 From: Evgeniy Polyakov <zbr@...emap.net> To: David Fries <david@...es.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Thorsten Bschorr <thorsten@...horr.de>, Jonathan ALIBERT <jonathan.alibert@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] w1_therm reference count family data Hi 09.05.2015, 03:52, "David Fries" <David@...es.net>: > A temperature conversion can take 750 ms and when possible the > w1_therm slave driver drops the bus_mutex to allow other bus > operations, but that includes operations such as a periodic slave > search, which can remove this slave when it is no longer detected. > If that happens the sl->family_data will be freed and set to NULL > causing w1_slave_show to crash when it wakes up. > > Signed-off-by: David Fries <David@...es.net> > Reported-By: Thorsten Bschorr <thorsten@...horr.de> > Tested-by: Thorsten Bschorr <thorsten@...horr.de> > Acked-by: Evgeniy Polyakov <zbr@...emap.net> > --- > This should be applied to the stable series as well. In the name of > full disclosure, this just narrows the race window, from crashing in > normal operation on the reporters system to no longer crashing with > multiple readers and another process hammering on inserting/removing > the slave device. Greg, please pull it upstream -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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