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drm/i915/dsi: double check element parsing against size if present 

Be a little paranoid in case the specs change or something.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/27050d48d0ff3d58e79fcacc41ced4c071b01424.1474286487.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2016-09-19 15:02:30 +03:00
parent 4b4f497e13
commit 8e4f768c43
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
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@ -441,7 +441,15 @@ static void generic_exec_sequence(struct drm_panel *panel, enum mipi_seq seq_id)
operation_size = *data++; operation_size = *data++;
if (mipi_elem_exec) { if (mipi_elem_exec) {
const u8 *next = data + operation_size;
data = mipi_elem_exec(intel_dsi, data); data = mipi_elem_exec(intel_dsi, data);
/* Consistency check if we have size. */
if (operation_size && data != next) {
DRM_ERROR("Inconsistent operation size\n");
return;
}
} else if (operation_size) { } else if (operation_size) {
/* We have size, skip. */ /* We have size, skip. */
DRM_DEBUG_KMS("Unsupported MIPI operation byte %u\n", DRM_DEBUG_KMS("Unsupported MIPI operation byte %u\n",