HID: i2c-hid: Limit reads to wMaxInputLength bytes for input events

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commit 6d00f37e49 upstream.

d1c7e29e8d (HID: i2c-hid: prevent buffer overflow in early IRQ)
changed hid_get_input() to read ihid->bufsize bytes, which can be
more than wMaxInputLength. This is the case with the Dell XPS 13
9343, and it is causing events to be missed. In some cases the
missed events are releases, which can cause the cursor to jump or
freeze, among other problems. Limit the number of bytes read to
min(wMaxInputLength, ihid->bufsize) to prevent such problems.

Fixes: d1c7e29e8d "HID: i2c-hid: prevent buffer overflow in early IRQ"
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Seth Forshee 2015-02-20 11:45:11 -06:00 • committed by Luis Henriques

parent 065f373545

commit 06edf928b8

1 changed files with 4 additions and 1 deletions

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drivers/hid/i2c-hid/i2c-hid.c

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