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greybus: operation: fix use-after-free and infinite loop on unhandled requests 

Make sure to return a proper response in case we get a request we do not
recognise.

This fixes an infinite loop and use-after-free bug, where the freed
operations structure would get re-added to the work queue indefinitely.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
hifive-unleashed-5.1
Johan Hovold 2015-03-27 12:41:15 +01:00 committed by Greg Kroah-Hartman
parent ea2c2ee805
commit ff65be7a58
1 changed files with 9 additions and 8 deletions
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17
drivers/staging/greybus/operation.c
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@ -208,14 +208,11 @@ static void gb_message_cancel(struct gb_message *message)
static void gb_operation_request_handle(struct gb_operation *operation)
{
struct gb_protocol *protocol = operation->connection->protocol;
int ret;
if (!protocol)
return;
/*
* If the protocol has no incoming request handler, report
* an error and mark the request bad.
*/
if (protocol->request_recv) {
protocol->request_recv(operation->type, operation);
return;
@ -223,10 +220,14 @@ static void gb_operation_request_handle(struct gb_operation *operation)
dev_err(&operation->connection->dev,
"unexpected incoming request type 0x%02hhx\n", operation->type);
if (gb_operation_result_set(operation, -EPROTONOSUPPORT))
queue_work(gb_operation_workqueue, &operation->work);
else
WARN(true, "failed to mark request bad\n");
ret = gb_operation_response_send(operation, -EPROTONOSUPPORT);
if (ret) {
dev_err(&operation->connection->dev,
"failed to send response %d: %d\n",
-EPROTONOSUPPORT, ret);
return;
}
}
/*