From: Pavel Begunkov asml.silence@gmail.com
commit 681fda8d27a66f7e65ff7f2d200d7635e64a8d05 upstream.
io_recvmsg() doesn't free memory allocated for struct io_buffer. This can causes a leak when used with automatic buffer selection.
Signed-off-by: Pavel Begunkov asml.silence@gmail.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/io_uring.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3884,10 +3884,16 @@ static int io_recvmsg(struct io_kiocb *r
ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg, kmsg->uaddr, flags); - if (force_nonblock && ret == -EAGAIN) - return io_setup_async_msg(req, kmsg); + if (force_nonblock && ret == -EAGAIN) { + ret = io_setup_async_msg(req, kmsg); + if (ret != -EAGAIN) + kfree(kbuf); + return ret; + } if (ret == -ERESTARTSYS) ret = -EINTR; + if (kbuf) + kfree(kbuf); }
if (kmsg && kmsg->iov != kmsg->fast_iov)