linux-kernel - [PATCH 3.16.y-ckt 090/183] tracing: Fix unmapping loop in tracing_mark

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Message-Id: <1425635874-19087-91-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Mar 2015 09:56:21 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Vikram Mulukutla <markivx@...eaurora.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 090/183] tracing: Fix unmapping loop in tracing_mark_write

3.16.7-ckt8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vikram Mulukutla <markivx@...eaurora.org>

commit 7215853e985a4bef1a6c14e00e89dfec84f1e457 upstream.

Commit 6edb2a8a385f0cdef51dae37ff23e74d76d8a6ce introduced
an array map_pages that contains the addresses returned by
kmap_atomic. However, when unmapping those pages, map_pages[0]
is unmapped before map_pages[1], breaking the nesting requirement
as specified in the documentation for kmap_atomic/kunmap_atomic.

This was caught by the highmem debug code present in kunmap_atomic.
Fix the loop to do the unmapping properly.

Link: http://lkml.kernel.org/r/1418871056-6614-1-git-send-email-markivx@codeaurora.org

Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
Reported-by: Lime Yang <limey@...eaurora.org>
Signed-off-by: Vikram Mulukutla <markivx@...eaurora.org>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 01603e48742e..8b924fb7f915 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4894,7 +4894,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	*fpos += written;
 
  out_unlock:
-	for (i = 0; i < nr_pages; i++){
+	for (i = nr_pages - 1; i >= 0; i--) {
 		kunmap_atomic(map_page[i]);
 		put_page(pages[i]);
 	}
--
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