w1_therm reference count family data
authorDavid Fries <David@Fries.net>
Sat, 9 May 2015 00:51:50 +0000 (19:51 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 24 May 2015 19:08:59 +0000 (12:08 -0700)
commitf7134eea05b2fb4a2c0935f8a540539fff01f3eb
tree756f42e02e8ca03891f7f2c01bb28405a27528b4
parentc3098356927254be270e5dc186a2ca144b64463b
w1_therm reference count family data

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@Fries.net>
Reported-By: Thorsten Bschorr <thorsten@bschorr.de>
Tested-by: Thorsten Bschorr <thorsten@bschorr.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/w1/slaves/w1_therm.c