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From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH for-5.20 2/3] io_uring/net: improve zc addr import error handling
Date: Mon, 15 Aug 2022 13:42:01 +0100	[thread overview]
Message-ID: <b8aae61f4c3ddc4da97c1da876bb73871f352d50.1660566179.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

We may account memory to a memcg of a request that didn't even got to
the network layer. It's not a bug as it'll be routinely cleaned up on
flush, but it might be confusing for the userspace.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 io_uring/net.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index 2129562bfd9f..f7cbd716817f 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -977,6 +977,14 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 	msg.msg_controllen = 0;
 	msg.msg_namelen = 0;
 
+	if (zc->addr) {
+		ret = move_addr_to_kernel(zc->addr, zc->addr_len, &address);
+		if (unlikely(ret < 0))
+			return ret;
+		msg.msg_name = (struct sockaddr *)&address;
+		msg.msg_namelen = zc->addr_len;
+	}
+
 	if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
 		ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu,
 					(u64)(uintptr_t)zc->buf, zc->len);
@@ -992,14 +1000,6 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 			return ret;
 	}
 
-	if (zc->addr) {
-		ret = move_addr_to_kernel(zc->addr, zc->addr_len, &address);
-		if (unlikely(ret < 0))
-			return ret;
-		msg.msg_name = (struct sockaddr *)&address;
-		msg.msg_namelen = zc->addr_len;
-	}
-
 	msg_flags = zc->msg_flags | MSG_ZEROCOPY;
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		msg_flags |= MSG_DONTWAIT;
-- 
2.37.0


  parent reply	other threads:[~2022-08-15 12:44 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-15 12:41 [PATCH for-5.20 0/3] small io_uring/net fixes and uapi improvements Pavel Begunkov
2022-08-15 12:42 ` [PATCH for-5.20 1/3] io_uring/net: use right helpers for async recycle Pavel Begunkov
2022-08-15 12:42 ` Pavel Begunkov [this message]
2022-08-15 12:42 ` [PATCH for-5.20 3/3] io_uring/notif: raise limit on notification slots Pavel Begunkov
2022-08-16  3:34 ` [PATCH for-5.20 0/3] small io_uring/net fixes and uapi improvements Jens Axboe

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