On 10/31/2013 02:48 AM, [email protected] wrote:
The patch below does not apply to the 3.11-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 2962aecef2878e2192ac9676700469678507c24d Mon Sep 17 00:00:00 2001
From: Hans-Frieder Vogt <[email protected]>
Date: Sun, 6 Oct 2013 21:13:35 +0200
Subject: [PATCH] w1 - fix fops in w1_bus_notify
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]>
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index c7c64f18..0781217d 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -613,6 +613,9 @@ static int w1_bus_notify(struct notifier_block *nb,
unsigned long action,
The patch should not be back-ported to 3.11, as w1_bus_notify() was
introduced since v3.12-rc1 in commit 47eba33
Thanks,
Zhouping
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... */
--
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