HID: i2c-hid: prevent buffer overflow in early IRQ

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commit d1c7e29e8d upstream.

Before ->start() is called, bufsize size is set to HID_MIN_BUFFER_SIZE,
64 bytes. While processing the IRQ, we were asking to receive up to
wMaxInputLength bytes, which can be bigger than 64 bytes.

Later, when ->start is run, a proper bufsize will be calculated.

Given wMaxInputLength is said to be unreliable in other part of the
code, set to receive only what we can even if it results in truncated
reports.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
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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Gwendal Grignou 2014-12-11 16:02:45 -08:00 • committed by Luis Henriques

parent 9cc8ab9ef8

commit 85ff89afa4

1 changed files with 1 additions and 1 deletions

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

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