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w1 - fix fops in w1_bus_notify

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Introduce a check to make sure that fops are only called if they have
been defined by the slave module.

Without this check modules like w1_smem cause a NULL pointer dereference
bug.

Signed-off by: Hans-Frieder Vogt <[email protected]>
Acked-by: Evgeniy Polyakov <[email protected]>
Cc: stable <[email protected]> # 3.11+

Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Hans-Frieder Vogt 2013-10-06 21:13:35 +02:00 • committed by Greg Kroah-Hartman
commit 2962aecef2
1 changed files with 3 additions and 0 deletions
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3
drivers/w1/w1.c
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@ -613,6 +613,9 @@ static int w1_bus_notify(struct notifier_block *nb, unsigned long action,
sl = dev_to_w1_slave(dev);
fops = sl->family->fops;
if (!fops)
return 0;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
/* if the family driver needs to initialize something... */