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drm/i915/audio: fix check for av_enc_map overflow

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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: 9965db26ac ("drm/i915: Check for fused or unused pipes")
Fixes: 0b7029b7e4 ("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 cdb3db8542)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Jani Nikula 2018-02-14 19:38:40 +02:00 committed by Rodrigo Vivi
parent b1b13780ab
commit 72a6d72c2c
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/intel_audio.c
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@ -779,11 +779,11 @@ static struct intel_encoder *get_saved_enc(struct drm_i915_private *dev_priv,
{
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