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drm/i915: Avoid overflowing the DP link rate arrays 

Complain loudly if we ever attempt to overflow the the supported_rates[]
array. This should never happen since the sink_rates[] array will always
be smaller or of equal size. But should someone change that we want to
catch it without scribblign over the stack.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-03-12 17:10:37 +02:00 committed by Daniel Vetter
parent ed4e9c1d46
commit e6bda3e4cb
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/intel_dp.c
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@ -1203,6 +1203,8 @@ static int intersect_rates(const int *source_rates, int source_len,
while (i < source_len && j < sink_len) {
if (source_rates[i] == sink_rates[j]) {
if (WARN_ON(k >= DP_MAX_SUPPORTED_RATES))
return k;
supported_rates[k] = source_rates[i];
++k;
++i;