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drm/i915/bios: fix off by one in parse_generic_dtd()

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The "num_dtd" variable is the number of elements in the
generic_dtd->dtd[] array so the > needs to be >= to prevent reading one
element beyond the end of the array.

Fixes: 33ef6d4fd8 ("drm/i915/vbt: Handle generic DTD block")
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191212091130.zf2g53njf5u24wk6@kili.mountain
This commit is contained in:
Dan Carpenter 2019-12-12 12:11:30 +03:00 committed by Jani Nikula
parent 601a9ee0f0
commit 8c8a854d6f
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_bios.c
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@ -340,7 +340,7 @@ parse_generic_dtd(struct drm_i915_private *dev_priv,
num_dtd = (get_blocksize(generic_dtd) -
sizeof(struct bdb_generic_dtd)) / generic_dtd->gdtd_size;
if (dev_priv->vbt.panel_type > num_dtd) {
if (dev_priv->vbt.panel_type >= num_dtd) {
DRM_ERROR("Panel type %d not found in table of %d DTD's\n",
dev_priv->vbt.panel_type, num_dtd);
return;