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io_uring: fix recvmsg memory leak with buffer selection 

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>
This commit is contained in:
Pavel Begunkov 2020-07-15 22:20:45 +03:00 committed by Jens Axboe
parent 16d598030a
commit 681fda8d27
1 changed files with 8 additions and 2 deletions
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10
fs/io_uring.c
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@ -3845,10 +3845,16 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock)
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)