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drivers/hid/hid-multitouch.c: fix a possible null pointer access. 

1002     if ((quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
1003         struct input_mt_slot *i_slot = &mt->slots[slotnum];
1004
1005         if (input_mt_is_active(i_slot) &&
1006             input_mt_is_used(mt, i_slot))
1007             return -EAGAIN;
1008     }

We previously assumed 'mt' could be null (see line 1002).

The following situation is similar, so add a judgement.

Signed-off-by: Pan Zhang <zhangpan26@huawei.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
This commit is contained in:
Pan Zhang 2019-12-19 10:45:30 +08:00 committed by Benjamin Tissoires
parent fe4e940f0f
commit 306d5acbfc
1 changed files with 1 additions and 1 deletions
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2
drivers/hid/hid-multitouch.c
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@ -1019,7 +1019,7 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
tool = MT_TOOL_DIAL;
else if (unlikely(!confidence_state)) {
tool = MT_TOOL_PALM;
if (!active &&
if (!active && mt &&
input_mt_is_active(&mt->slots[slotnum])) {
/*
* The non-confidence was reported for