From: Ville Syrjälä <[email protected]> Unify the SPI vs. PCI ROM VBT read codepaths a bit by pulling some size overflow checks from the PCI side into the SPI side.
Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/display/intel_bios.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index cd32c9cd38a9..86b81fd23f58 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -3088,11 +3088,22 @@ static struct vbt_header *spi_oprom_get_vbt(struct intel_display *display, if (count >= oprom_size) goto err_not_found; + if (sizeof(struct vbt_header) > oprom_size - count) { + drm_dbg(display->drm, "VBT header incomplete\n"); + goto err_not_found; + } + /* Get VBT size and allocate space for the VBT */ vbt_size = intel_spi_read(&i915->uncore, found + offsetof(struct vbt_header, vbt_size)); vbt_size &= 0xffff; + if (vbt_size > oprom_size - count) { + drm_dbg(display->drm, + "VBT incomplete (vbt_size overflows)\n"); + goto err_not_found; + } + vbt = kzalloc(round_up(vbt_size, 4), GFP_KERNEL); if (!vbt) goto err_not_found; -- 2.44.2
