From: Allan Stephens <allan.stephens@windriver.com>
Date: Mon, 23 May 2011 17:57:25 +0000 (-0400)
Subject: tipc: Add sanity check to detect rejection of non-payload messages
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=76d12527f74ad1b42b068252fdd2056c8ae48a99;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

tipc: Add sanity check to detect rejection of non-payload messages

Introduces an internal sanity check to ensure that the only undeliverable
messages TIPC attempts to return to their origin are application payload
messages.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---

diff --git a/net/tipc/port.c b/net/tipc/port.c
index 3946b5b10c74..756e64cbff96 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -367,6 +367,12 @@ int tipc_reject_msg(struct sk_buff *buf, u32 err)
 		imp++;
 
 	/* discard rejected message if it shouldn't be returned to sender */
+
+	if (WARN(!msg_isdata(msg),
+		 "attempt to reject message with user=%u", msg_user(msg))) {
+		dump_stack();
+		goto exit;
+	}
 	if (msg_errcode(msg) || msg_dest_droppable(msg))
 		goto exit;