From: Jens Axboe <axboe@kernel.dk>
To: io-uring <io-uring@vger.kernel.org>
Subject: [PATCH] io_uring/net: correctly handle multishot recvmsg retry setup
Date: Thu, 7 Mar 2024 17:51:38 -0700 [thread overview]
Message-ID: <0baadaaf-2f6b-40d7-b7ec-e0e175e3c4ed@kernel.dk> (raw)
If we loop for multishot receive on the initial attempt, and then abort
later on to wait for more, we miss a case where we should be copying the
io_async_msghdr from the stack to stable storage. This leads to the next
retry potentially failing, if the application had the msghdr on the
stack.
Cc: stable@vger.kernel.org
Fixes: 9bb66906f23e ("io_uring: support multishot in recvmsg")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
diff --git a/io_uring/net.c b/io_uring/net.c
index e50947e7cd57..52f0d3b735fd 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -931,7 +931,8 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
kfree(kmsg->free_iov);
io_netmsg_recycle(req, issue_flags);
req->flags &= ~REQ_F_NEED_CLEANUP;
- }
+ } else if (ret == -EAGAIN)
+ return io_setup_async_msg(req, kmsg, issue_flags);
return ret;
}
--
Jens Axboe
reply other threads:[~2024-03-08 0:51 UTC|newest]
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