Patch "drm/i915/audio: fix check for av_enc_map overflow" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/i915/audio: fix check for av_enc_map overflow

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-audio-fix-check-for-av_enc_map-overflow.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 72a6d72c2cd03bba7b70117b63dea83d2de88057 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@intel.com>
Date: Wed, 14 Feb 2018 19:38:40 +0200
Subject: drm/i915/audio: fix check for av_enc_map overflow

From: Jani Nikula <jani.nikula@intel.com>

commit 72a6d72c2cd03bba7b70117b63dea83d2de88057 upstream.

Turns out -1 >= ARRAY_SIZE() is always true. Move the bounds check where
we know pipe >= 0 and next to the array indexing where it makes most
sense.

Fixes: 9965db26ac05 ("drm/i915: Check for fused or unused pipes")
Fixes: 0b7029b7e43f ("drm/i915: Check for fused or unused pipes")
Cc: <stable@vger.kernel.org> # v4.10+
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214173840.25360-1-jani.nikula@intel.com
(cherry picked from commit cdb3db8542d854bd678d60cd28861b042e191672)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/intel_audio.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -754,11 +754,11 @@ static struct intel_encoder *get_saved_e
 {
 	struct intel_encoder *encoder;
 
-	if (WARN_ON(pipe >= ARRAY_SIZE(dev_priv->av_enc_map)))
-		return NULL;
-
 	/* MST */
 	if (pipe >= 0) {
+		if (WARN_ON(pipe >= ARRAY_SIZE(dev_priv->av_enc_map)))
+			return NULL;
+
 		encoder = dev_priv->av_enc_map[pipe];
 		/*
 		 * when bootup, audio driver may not know it is


Patches currently in stable-queue which might be from jani.nikula@intel.com are

queue-4.15/drm-i915-audio-fix-check-for-av_enc_map-overflow.patch
queue-4.15/documentation-sphinx-fix-directive-import-error.patch
queue-4.15/drm-i915-check-for-fused-or-unused-pipes.patch