[PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Gabriel Krisman Bertazi]

[ Upstream commit 3979840cd858f30f43ea9f4e7f7f1f56de82d698 ]
This fixes a memory leak due to the lack of the cleanup hook for the
iovec.  The stable backport differs from upstream by dropping the
io_connect_bpf_populate hunk, which didn't exist at the time and by
fixing the merge conflict due to the introduction of
io_bind_file_create.

Both IORING_OP_CONNECT and IORING_OP_BIND reuse the msghdr object just
to store the sockaddr. Beyond allocating a much larger object than
needed, msghdr can also wrap an iovec, which will be recycled
unnecessarily. This uses the sockaddr directly.

Cc: stable@vger.kernel.org
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://patch.msgid.link/20260602215327.1885109-2-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
 io_uring/net.c   | 36 ++++++++++++++++++------------------
 io_uring/opdef.c |  4 ++--
 2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index 7595850c2217..e34eb1624a2c 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1770,7 +1770,7 @@ int io_socket(struct io_kiocb *req, unsigned int issue_flags)
 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
-	struct io_async_msghdr *io;
+	struct sockaddr_storage *addr;
 
 	if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
 		return -EINVAL;
@@ -1779,17 +1779,17 @@ int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	conn->addr_len =  READ_ONCE(sqe->addr2);
 	conn->in_progress = conn->seen_econnaborted = false;
 
-	io = io_msg_alloc_async(req);
-	if (unlikely(!io))
+	addr = io_uring_alloc_async_data(NULL, req);
+	if (unlikely(!addr))
 		return -ENOMEM;
 
-	return move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
+	return move_addr_to_kernel(conn->addr, conn->addr_len, addr);
 }
 
 int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
-	struct io_async_msghdr *io = req->async_data;
+	struct sockaddr_storage *addr = req->async_data;
 	unsigned file_flags;
 	int ret;
 	bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
@@ -1803,8 +1803,7 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 
 	file_flags = force_nonblock ? O_NONBLOCK : 0;
 
-	ret = __sys_connect_file(req->file, &io->addr, connect->addr_len,
-				 file_flags);
+	ret = __sys_connect_file(req->file, addr, connect->addr_len, file_flags);
 	if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
 	    && force_nonblock) {
 		if (ret == -EINPROGRESS) {
@@ -1833,7 +1832,6 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 out:
 	if (ret < 0)
 		req_set_fail(req);
-	io_req_msg_cleanup(req, issue_flags);
 	io_req_set_res(req, ret, 0);
 	return IOU_COMPLETE;
 }
@@ -1843,15 +1841,15 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
  * which in turn end up in mnt_want_write() which will grab the fs
  * percpu start write sem. This can trigger a lockdep warning.
  */
-static int io_bind_file_create(const struct io_async_msghdr *io, int addr_len)
+static int io_bind_file_create(const struct sockaddr_storage *addr, int addr_len)
 {
 	const struct sockaddr_un *sun;
 
-	if (io->addr.ss_family != AF_UNIX)
+	if (addr->ss_family != AF_UNIX)
 		return 0;
 	if (addr_len <= offsetof(struct sockaddr_un, sun_path))
 		return 0;
-	sun = (const struct sockaddr_un *) &io->addr;
+	sun = (const struct sockaddr_un *) addr;
 	return sun->sun_path[0] != '\0';
 }
 
@@ -1859,7 +1857,7 @@ int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
 	struct sockaddr __user *uaddr;
-	struct io_async_msghdr *io;
+	struct sockaddr_storage *addr;
 	int ret;
 
 	if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
@@ -1868,21 +1866,23 @@ int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	uaddr = u64_to_user_ptr(READ_ONCE(sqe->addr));
 	bind->addr_len =  READ_ONCE(sqe->addr2);
 
-	io = io_msg_alloc_async(req);
-	if (unlikely(!io))
+	addr = io_uring_alloc_async_data(NULL, req);
+	if (unlikely(!addr))
 		return -ENOMEM;
-	ret = move_addr_to_kernel(uaddr, bind->addr_len, &io->addr);
+
+	ret = move_addr_to_kernel(uaddr, bind->addr_len, addr);
 	if (unlikely(ret))
 		return ret;
-	if (io_bind_file_create(io, bind->addr_len))
+	if (io_bind_file_create(addr, bind->addr_len))
 		req->flags |= REQ_F_FORCE_ASYNC;
 	return 0;
 }
 
+
 int io_bind(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
-	struct io_async_msghdr *io = req->async_data;
+	struct sockaddr_storage *addr = req->async_data;
 	struct socket *sock;
 	int ret;
 
@@ -1890,7 +1890,7 @@ int io_bind(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(!sock))
 		return -ENOTSOCK;
 
-	ret = __sys_bind_socket(sock, &io->addr, bind->addr_len);
+	ret = __sys_bind_socket(sock, addr, bind->addr_len);
 	if (ret < 0)
 		req_set_fail(req);
 	io_req_set_res(req, ret, 0);
diff --git a/io_uring/opdef.c b/io_uring/opdef.c
index 932319633eac..a57c820567f7 100644
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -207,7 +207,7 @@ const struct io_issue_def io_issue_defs[] = {
 		.unbound_nonreg_file	= 1,
 		.pollout		= 1,
 #if defined(CONFIG_NET)
-		.async_size		= sizeof(struct io_async_msghdr),
+		.async_size		= sizeof(struct sockaddr_storage),
 		.prep			= io_connect_prep,
 		.issue			= io_connect,
 #else
@@ -504,7 +504,7 @@ const struct io_issue_def io_issue_defs[] = {
 		.needs_file		= 1,
 		.prep			= io_bind_prep,
 		.issue			= io_bind,
-		.async_size		= sizeof(struct io_async_msghdr),
+		.async_size		= sizeof(struct sockaddr_storage),
 #else
 		.prep			= io_eopnotsupp_prep,
 #endif
-- 
2.54.0

Re: [PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Greg KH]

On Wed, Jun 17, 2026 at 01:51:02PM -0400, Gabriel Krisman Bertazi wrote:
> [ Upstream commit 3979840cd858f30f43ea9f4e7f7f1f56de82d698 ]
> This fixes a memory leak due to the lack of the cleanup hook for the
> iovec.  The stable backport differs from upstream by dropping the
> io_connect_bpf_populate hunk, which didn't exist at the time and by
> fixing the merge conflict due to the introduction of
> io_bind_file_create.
> 
> Both IORING_OP_CONNECT and IORING_OP_BIND reuse the msghdr object just
> to store the sockaddr. Beyond allocating a much larger object than
> needed, msghdr can also wrap an iovec, which will be recycled
> unnecessarily. This uses the sockaddr directly.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
> Link: https://patch.msgid.link/20260602215327.1885109-2-krisman@suse.de
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
> ---
>  io_uring/net.c   | 36 ++++++++++++++++++------------------
>  io_uring/opdef.c |  4 ++--
>  2 files changed, 20 insertions(+), 20 deletions(-)

This isn't in any release yet, why just 6.18?  And why wan't it
originally tagged for stable?

thanks,

greg k-h

Re: [PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Gabriel Krisman Bertazi]

Greg KH <gregkh@linuxfoundation.org> writes:

> On Wed, Jun 17, 2026 at 01:51:02PM -0400, Gabriel Krisman Bertazi wrote:
>> [ Upstream commit 3979840cd858f30f43ea9f4e7f7f1f56de82d698 ]
>> This fixes a memory leak due to the lack of the cleanup hook for the
>> iovec.  The stable backport differs from upstream by dropping the
>> io_connect_bpf_populate hunk, which didn't exist at the time and by
>> fixing the merge conflict due to the introduction of
>> io_bind_file_create.
>> 
>> Both IORING_OP_CONNECT and IORING_OP_BIND reuse the msghdr object just
>> to store the sockaddr. Beyond allocating a much larger object than
>> needed, msghdr can also wrap an iovec, which will be recycled
>> unnecessarily. This uses the sockaddr directly.
>> 
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
>> Link: https://patch.msgid.link/20260602215327.1885109-2-krisman@suse.de
>> Signed-off-by: Jens Axboe <axboe@kernel.dk>
>> Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
>> ---
>>  io_uring/net.c   | 36 ++++++++++++++++++------------------
>>  io_uring/opdef.c |  4 ++--
>>  2 files changed, 20 insertions(+), 20 deletions(-)
>
> This isn't in any release yet?

It is queued in Linus tree during the current merge window for 7.2

>  why just 6.18?

The backports are slightly different, so they were sent separately. The bug
exists since 6.12.

> And why wan't it
> originally tagged for stable?

Because it was originally a clean up that we later realized fixes a bug
and should go to stable.

> thanks,
>
> greg k-h

-- 
Gabriel Krisman Bertazi

Re: [PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Gabriel Krisman Bertazi]

Gabriel Krisman Bertazi <krisman@suse.de> writes:

> The backports are slightly different, so they were sent separately. The bug
> exists since 6.12.

6.12: https://lore.kernel.org/stable/20260617175158.2977825-1-krisman@suse.de/T/#u
7.1: https://lore.kernel.org/stable/20260617174947.2975419-1-krisman@suse.de/T/#u

Do you need 7.0 too?  I assumed 7.0 was EOL after the 7.1 release, if not LTS.

-- 
Gabriel Krisman Bertazi

Re: [PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Greg KH]

On Wed, Jun 17, 2026 at 02:45:31PM -0400, Gabriel Krisman Bertazi wrote:
> Gabriel Krisman Bertazi <krisman@suse.de> writes:
> 
> > The backports are slightly different, so they were sent separately. The bug
> > exists since 6.12.
> 
> 6.12: https://lore.kernel.org/stable/20260617175158.2977825-1-krisman@suse.de/T/#u
> 7.1: https://lore.kernel.org/stable/20260617174947.2975419-1-krisman@suse.de/T/#u
> 
> Do you need 7.0 too?  I assumed 7.0 was EOL after the 7.1 release, if not LTS.

It will be EOL in a week or so, it's your call.  But I can't take a 6.18
or 6.12 version until that happens.

thanks,

greg k-h

[PATCH stable-7.0.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Gabriel Krisman Bertazi]

[ Upstream commit 3979840cd858f30f43ea9f4e7f7f1f56de82d698 ]
This fixes a memory leak due to the lack of the cleanup hook for the
iovec.  The stable backport differs from upstream by dropping the
io_connect_bpf_populate hunk, which didn't exist at the time and by
fixing the merge conflict due to the introduction of
io_bind_file_create.

Both IORING_OP_CONNECT and IORING_OP_BIND reuse the msghdr object just
to store the sockaddr. Beyond allocating a much larger object than
needed, msghdr can also wrap an iovec, which will be recycled
unnecessarily. This uses the sockaddr directly.

Cc: stable@vger.kernel.org
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://patch.msgid.link/20260602215327.1885109-2-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
 io_uring/net.c   | 36 ++++++++++++++++++------------------
 io_uring/opdef.c |  4 ++--
 2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index 5bd3fa5a2b6d..85efde185a2b 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1774,7 +1774,7 @@ int io_socket(struct io_kiocb *req, unsigned int issue_flags)
 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
-	struct io_async_msghdr *io;
+	struct sockaddr_storage *addr;
 
 	if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
 		return -EINVAL;
@@ -1783,17 +1783,17 @@ int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	conn->addr_len =  READ_ONCE(sqe->addr2);
 	conn->in_progress = conn->seen_econnaborted = false;
 
-	io = io_msg_alloc_async(req);
-	if (unlikely(!io))
+	addr = io_uring_alloc_async_data(NULL, req);
+	if (unlikely(!addr))
 		return -ENOMEM;
 
-	return move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
+	return move_addr_to_kernel(conn->addr, conn->addr_len, addr);
 }
 
 int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
-	struct io_async_msghdr *io = req->async_data;
+	struct sockaddr_storage *addr = req->async_data;
 	unsigned file_flags;
 	int ret;
 	bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
@@ -1807,8 +1807,7 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 
 	file_flags = force_nonblock ? O_NONBLOCK : 0;
 
-	ret = __sys_connect_file(req->file, &io->addr, connect->addr_len,
-				 file_flags);
+	ret = __sys_connect_file(req->file, addr, connect->addr_len, file_flags);
 	if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
 	    && force_nonblock) {
 		if (ret == -EINPROGRESS) {
@@ -1837,7 +1836,6 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 out:
 	if (ret < 0)
 		req_set_fail(req);
-	io_req_msg_cleanup(req, issue_flags);
 	io_req_set_res(req, ret, 0);
 	return IOU_COMPLETE;
 }
@@ -1847,15 +1845,15 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
  * which in turn end up in mnt_want_write() which will grab the fs
  * percpu start write sem. This can trigger a lockdep warning.
  */
-static int io_bind_file_create(const struct io_async_msghdr *io, int addr_len)
+static int io_bind_file_create(const struct sockaddr_storage *addr, int addr_len)
 {
 	const struct sockaddr_un *sun;
 
-	if (io->addr.ss_family != AF_UNIX)
+	if (addr->ss_family != AF_UNIX)
 		return 0;
 	if (addr_len <= offsetof(struct sockaddr_un, sun_path))
 		return 0;
-	sun = (const struct sockaddr_un *) &io->addr;
+	sun = (const struct sockaddr_un *) addr;
 	return sun->sun_path[0] != '\0';
 }
 
@@ -1863,7 +1861,7 @@ int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
 	struct sockaddr __user *uaddr;
-	struct io_async_msghdr *io;
+	struct sockaddr_storage *addr;
 	int ret;
 
 	if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
@@ -1872,21 +1870,23 @@ int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	uaddr = u64_to_user_ptr(READ_ONCE(sqe->addr));
 	bind->addr_len =  READ_ONCE(sqe->addr2);
 
-	io = io_msg_alloc_async(req);
-	if (unlikely(!io))
+	addr = io_uring_alloc_async_data(NULL, req);
+	if (unlikely(!addr))
 		return -ENOMEM;
-	ret = move_addr_to_kernel(uaddr, bind->addr_len, &io->addr);
+
+	ret = move_addr_to_kernel(uaddr, bind->addr_len, addr);
 	if (unlikely(ret))
 		return ret;
-	if (io_bind_file_create(io, bind->addr_len))
+	if (io_bind_file_create(addr, bind->addr_len))
 		req->flags |= REQ_F_FORCE_ASYNC;
 	return 0;
 }
 
+
 int io_bind(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
-	struct io_async_msghdr *io = req->async_data;
+	struct sockaddr_storage *addr = req->async_data;
 	struct socket *sock;
 	int ret;
 
@@ -1894,7 +1894,7 @@ int io_bind(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(!sock))
 		return -ENOTSOCK;
 
-	ret = __sys_bind_socket(sock, &io->addr, bind->addr_len);
+	ret = __sys_bind_socket(sock, addr, bind->addr_len);
 	if (ret < 0)
 		req_set_fail(req);
 	io_req_set_res(req, ret, 0);
diff --git a/io_uring/opdef.c b/io_uring/opdef.c
index 91a23baf415e..2e1752df8748 100644
--- a/io_uring/opdef.c
+++ b/io_uring/opdef.c
@@ -207,7 +207,7 @@ const struct io_issue_def io_issue_defs[] = {
 		.unbound_nonreg_file	= 1,
 		.pollout		= 1,
 #if defined(CONFIG_NET)
-		.async_size		= sizeof(struct io_async_msghdr),
+		.async_size		= sizeof(struct sockaddr_storage),
 		.prep			= io_connect_prep,
 		.issue			= io_connect,
 #else
@@ -510,7 +510,7 @@ const struct io_issue_def io_issue_defs[] = {
 		.needs_file		= 1,
 		.prep			= io_bind_prep,
 		.issue			= io_bind,
-		.async_size		= sizeof(struct io_async_msghdr),
+		.async_size		= sizeof(struct sockaddr_storage),
 #else
 		.prep			= io_eopnotsupp_prep,
 #endif
-- 
2.54.0

Re: [PATCH stable-6.18.y] io_uring/net: Avoid msghdr on op_connect/op_bind async data

[Greg KH]

On Wed, Jun 17, 2026 at 02:40:56PM -0400, Gabriel Krisman Bertazi wrote:
> Greg KH <gregkh@linuxfoundation.org> writes:
> 
> > On Wed, Jun 17, 2026 at 01:51:02PM -0400, Gabriel Krisman Bertazi wrote:
> >> [ Upstream commit 3979840cd858f30f43ea9f4e7f7f1f56de82d698 ]
> >> This fixes a memory leak due to the lack of the cleanup hook for the
> >> iovec.  The stable backport differs from upstream by dropping the
> >> io_connect_bpf_populate hunk, which didn't exist at the time and by
> >> fixing the merge conflict due to the introduction of
> >> io_bind_file_create.
> >> 
> >> Both IORING_OP_CONNECT and IORING_OP_BIND reuse the msghdr object just
> >> to store the sockaddr. Beyond allocating a much larger object than
> >> needed, msghdr can also wrap an iovec, which will be recycled
> >> unnecessarily. This uses the sockaddr directly.
> >> 
> >> Cc: stable@vger.kernel.org
> >> Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
> >> Link: https://patch.msgid.link/20260602215327.1885109-2-krisman@suse.de
> >> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> >> Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
> >> ---
> >>  io_uring/net.c   | 36 ++++++++++++++++++------------------
> >>  io_uring/opdef.c |  4 ++--
> >>  2 files changed, 20 insertions(+), 20 deletions(-)
> >
> > This isn't in any release yet?
> 
> It is queued in Linus tree during the current merge window for 7.2

Ah, so it's not even in a released -rc yet.

> >  why just 6.18?
> 
> The backports are slightly different, so they were sent separately. The bug
> exists since 6.12.

I missed seeing a backport for 7.0, shouldn't it also go there?

thanks,

greg k-h