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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2017-03-10 10:10:54 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-03-10 10:22:53 -0800
commitb6573da139ecbee6f2c77392b51266d4521d50ac (patch)
treedf161bc74a23fc597b942f26160fb0157770d315 /drivers/input
parent45838660e34d90db8d4f7cbc8fd66e8aff79f4fe (diff)
downloadlinux-b6573da139ecbee6f2c77392b51266d4521d50ac.tar.bz2
Input: synaptics-rmi4 - prevent null pointer dereference in f30
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> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/rmi4/rmi_f30.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/input/rmi4/rmi_f30.c b/drivers/input/rmi4/rmi_f30.c
index 3422464af229..b8572b342dcb 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);