From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Andrew Duggan <aduggan@synaptics.com>
Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Subject: [PATCH] Input: rmi4 - prevent null pointer dereference in f30
Date: Fri, 10 Mar 2017 19:05:52 +0100 [thread overview]
Message-ID: <20170310180552.8375-1-benjamin.tissoires@redhat.com> (raw)
If the platform data has f30_data.disable set, f30 in rmi_f30_config()
might be null. Prevent a kernel oops by checking for non-null f30.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
drivers/input/rmi4/rmi_f30.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/rmi4/rmi_f30.c b/drivers/input/rmi4/rmi_f30.c
index d8ff285..a0e4030 100644
--- a/drivers/input/rmi4/rmi_f30.c
+++ b/drivers/input/rmi4/rmi_f30.c
@@ -170,6 +170,10 @@ static int rmi_f30_config(struct rmi_function *fn)
rmi_get_platform_data(fn->rmi_dev);
int error;
+ /* can happen if f30_data.disable is set */
+ if (!f30)
+ return 0;
+
if (pdata->f30_data.trackstick_buttons) {
/* Try [re-]establish link to F03. */
f30->f03 = rmi_find_function(fn->rmi_dev, 0x03);
--
2.9.3
next reply other threads:[~2017-03-10 18:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-10 18:05 Benjamin Tissoires [this message]
2017-03-10 18:23 ` [PATCH] Input: rmi4 - prevent null pointer dereference in f30 Dmitry Torokhov
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