lkml.org 
[lkml]   [2020]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH v2 1/3] HID: hid-bigbenff: fix general protection fault caused by double kfree
From
Date
HID: hid-bigbenff: fix general protection fault caused by double kfree

The struct *bigben was allocated via devm_kzalloc() and then used as a
parameter in input_ff_create_memless(). This caused a double kfree
during removal of the device, since both the managed resource API and
ml_ff_destroy() in drivers/input/ff-memless.c would call kfree() on it.

Signed-off-by: Hanno Zulla <kontakt@hanno.de>
---
drivers/hid/hid-bigbenff.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c
index 3f6abd190df4..f7e85bacb688 100644
--- a/drivers/hid/hid-bigbenff.c
+++ b/drivers/hid/hid-bigbenff.c
@@ -220,10 +220,16 @@ static void bigben_worker(struct work_struct *work)
static int hid_bigben_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
- struct bigben_device *bigben = data;
+ struct hid_device *hid = input_get_drvdata(dev);
+ struct bigben_device *bigben = hid_get_drvdata(hid);
u8 right_motor_on;
u8 left_motor_force;

+ if (!bigben) {
+ hid_err(hid, "no device data\n");
+ return 0;
+ }
+
if (effect->type != FF_RUMBLE)
return 0;

@@ -341,7 +347,7 @@ static int bigben_probe(struct hid_device *hid,

INIT_WORK(&bigben->worker, bigben_worker);

- error = input_ff_create_memless(hidinput->input, bigben,
+ error = input_ff_create_memless(hidinput->input, NULL,
hid_bigben_play_effect);
if (error)
return error;
--
2.20.1
\
 
 \ /
  Last update: 2020-02-18 12:39    [W:0.050 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site