From: Kyle McMartin <kyle@parisc-linux.org>
Date: Wed, 30 May 2007 06:36:00 +0000 (-0400)
Subject: [PARISC] be more defensive in process.c::get_wchan
X-Git-Tag: v2.6.22-rc5~36^2~3
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc650a7a9f5ebc3f9290a8e20e3f55b4f52f849e;p=linux-2.6

[PARISC] be more defensive in process.c::get_wchan

While debugging, I noticed we don't check the task_struct arg passed to
get_wchan, whereas everyone else does.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
---

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 0dd3847f49..355664812b 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -381,6 +381,10 @@ get_wchan(struct task_struct *p)
 	struct unwind_frame_info info;
 	unsigned long ip;
 	int count = 0;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
 	/*
 	 * These bracket the sleeping functions..
 	 */