mirrors/pycapnp
1
0
Fork 0
mirror of https://github.com/capnproto/pycapnp.git synced 2025-03-04 08:24:43 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Avoid reading random values for reader options from dangling reference (#300)

Browse source 
This patch fixes a problem of reading random values for reader options
in pycapnp. The code which adds task to the list captures 'opts' by
reference and that causes a problem in case when 'opts' is allocated on
on the caller's stack. By the time when task is handled the stack frame
holding the 'opts' is gone which leaves dangling reference to 'opts' in
lambda's captures. As a result pycapnp reads random values for reader
options which sometimes causes unexpected errors (for example an error
that nesting level ius negative).
This commit is contained in:
Sergey Dmitriev 2022-11-02 03:00:01 +07:00 • committed by GitHub
parent 1814105967
commit e614da1025
Failed to generate hash of commit
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
capnp/helpers/rpcHelper.h
View file

@ -40,7 +40,7 @@ struct ServerContext {
void acceptLoop(kj::TaskSet & tasks, capnp::Capability::Client client, kj::Own<kj::ConnectionReceiver>&& listener, capnp::ReaderOptions & opts) {
auto ptr = listener.get();
tasks.add(ptr->accept().then(kj::mvCapture(kj::mv(listener),
[&, client](kj::Own<kj::ConnectionReceiver>&& listener,
[&, client, opts](kj::Own<kj::ConnectionReceiver>&& listener,
kj::Own<kj::AsyncIoStream>&& connection) mutable {
acceptLoop(tasks, client, kj::mv(listener), opts);
@ -58,7 +58,7 @@ kj::Promise<PyObject *> connectServer(kj::TaskSet & tasks, capnp::Capability::Cl
tasks.add(context->provider->getNetwork().parseAddress(bindAddress)
.then(kj::mvCapture(paf.fulfiller,
[&, client](kj::Own<kj::PromiseFulfiller<unsigned int>>&& portFulfiller,
[&, client, opts](kj::Own<kj::PromiseFulfiller<unsigned int>>&& portFulfiller,
kj::Own<kj::NetworkAddress>&& addr) mutable {
auto listener = addr->listen();
portFulfiller->fulfill(listener->getPort());