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

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 <[email protected]> know about it.

From: Jani Nikula <[email protected]>
Date: Wed, 14 Feb 2018 19:38:40 +0200
Subject: drm/i915/audio: fix check for av_enc_map overflow

From: Jani Nikula <[email protected]>

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.

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

@@ -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 [email protected] 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