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greybus: gpio: fix null-deref on short irq requests

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Make sure to verify the length of incoming requests before trying to
parse the request buffer, which can even be NULL on empty requests.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
This commit is contained in:
Johan Hovold 2015-03-27 12:45:41 +01:00 committed by Greg Kroah-Hartman
parent 0150bd7f23
commit 1842dd8b7b
1 changed files with 6 additions and 0 deletions
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6
drivers/staging/greybus/gpio.c
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@ -413,6 +413,12 @@ static void gb_gpio_request_recv(u8 type, struct gb_operation *op)
ggc = connection->private;
request = op->request;
if (request->payload_size < sizeof(*event)) {
dev_err(ggc->chip.dev, "short event received\n");
return;
}
event = request->payload;
if (event->which > ggc->line_max) {
dev_err(ggc->chip.dev, "invalid hw irq: %d\n", event->which);