From ae6bc4dd64e149270a86d649c92728432a50945f Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander.neumann@redteam-pentesting.de>
Date: Fri, 4 Mar 2022 10:38:10 +0100
Subject: [PATCH] tun/netstack: check error returned by SetDeadline()
Signed-off-by: Alexander Neumann <alexander.neumann@redteam-pentesting.de>
[Jason: don't wrap deadline error.]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
tun/netstack/tun.go | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tun/netstack/tun.go b/tun/netstack/tun.go
index ebdd5f1..8b1bb7f 100644
--- a/tun/netstack/tun.go
+++ b/tun/netstack/tun.go
@@ -690,7 +690,10 @@ func (tnet *Net) exchange(ctx context.Context, server netip.Addr, q dnsmessage.Q
return dnsmessage.Parser{}, dnsmessage.Header{}, err
}
if d, ok := ctx.Deadline(); ok && !d.IsZero() {
- c.SetDeadline(d)
+ err := c.SetDeadline(d)
+ if err != nil {
+ return dnsmessage.Parser{}, dnsmessage.Header{}, err
+ }
}
var p dnsmessage.Parser
var h dnsmessage.Header