diff mbox series

[bpf-next,4/4] xsk: lock the control mutex in sock_diag interface

Message ID 20190822091306.20581-5-bjorn.topel@gmail.com
State Changes Requested
Delegated to: BPF Maintainers
Headers show
Series xsk: various CPU barrier and {READ, WRITE}_ONCE fixes | expand

Commit Message

Björn Töpel Aug. 22, 2019, 9:13 a.m. UTC 
From: Björn Töpel <bjorn.topel@intel.com>

When accessing the members of an XDP socket, the control mutex should
be held. This commit fixes that.

Fixes: a36b38aa2af6 ("xsk: add sock_diag interface for AF_XDP")
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
---
 net/xdp/xsk_diag.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Jonathan Lemon Aug. 23, 2019, 4:44 p.m. UTC | #1 
On 22 Aug 2019, at 2:13, Björn Töpel wrote:

> From: Björn Töpel <bjorn.topel@intel.com>
>
> When accessing the members of an XDP socket, the control mutex should
> be held. This commit fixes that.
>
> Fixes: a36b38aa2af6 ("xsk: add sock_diag interface for AF_XDP")
> Signed-off-by: Björn Töpel <bjorn.topel@intel.com>

Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
diff mbox series

Patch

diff --git a/net/xdp/xsk_diag.c b/net/xdp/xsk_diag.c
index d5e06c8e0cbf..c8f4f11edbbc 100644
--- a/net/xdp/xsk_diag.c
+++ b/net/xdp/xsk_diag.c
@@ -97,6 +97,7 @@  static int xsk_diag_fill(struct sock *sk, struct sk_buff *nlskb,
 	msg->xdiag_ino = sk_ino;
 	sock_diag_save_cookie(sk, msg->xdiag_cookie);
 
+	mutex_lock(&xs->mutex);
 	if ((req->xdiag_show & XDP_SHOW_INFO) && xsk_diag_put_info(xs, nlskb))
 		goto out_nlmsg_trim;
 
@@ -117,10 +118,12 @@  static int xsk_diag_fill(struct sock *sk, struct sk_buff *nlskb,
 	    sock_diag_put_meminfo(sk, nlskb, XDP_DIAG_MEMINFO))
 		goto out_nlmsg_trim;
 
+	mutex_unlock(&xs->mutex);
 	nlmsg_end(nlskb, nlh);
 	return 0;
 
 out_nlmsg_trim:
+	mutex_unlock(&xs->mutex);
 	nlmsg_cancel(nlskb, nlh);
 	return -EMSGSIZE;
 }