linux-kernel - [PATCH 3.12 33/82] drm/i915: Pair va_copy with va_end in i915_error

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Date:	Thu, 20 Feb 2014 15:52:16 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mika Kuoppala <mika.kuoppala@...el.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 3.12 33/82] drm/i915: Pair va_copy with va_end in i915_error_vprintf

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

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

From: Mika Kuoppala <mika.kuoppala@...ux.intel.com>

commit 1d2cb9a54abc6e1d239f28f07661366d5662a94a upstream.

Each invocation of va_copy() must be matched by a corresponding
invocation of va_end() in the same function.

This regression has been introduced in

commit e29bb4ebbf000ff9ac081d29784a3331618f012e
Author: Chris Wilson <chris@...is-wilson.co.uk>
Date:   Fri Sep 20 10:20:59 2013 +0100

    drm/i915: Use a temporary va_list for two-pass string handling

Signed-off-by: Mika Kuoppala <mika.kuoppala@...el.com>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_gpu_error.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -146,7 +146,10 @@ static void i915_error_vprintf(struct dr
 		va_list tmp;
 
 		va_copy(tmp, args);
-		if (!__i915_error_seek(e, vsnprintf(NULL, 0, f, tmp)))
+		len = vsnprintf(NULL, 0, f, tmp);
+		va_end(tmp);
+
+		if (!__i915_error_seek(e, len))
 			return;
 	}
 


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