drm/dp_mst: Check crc4 value while building sideband message (d6b8bbca) · Commits · 戴 / test

Check that computed crc value is matching the one encoded in the message. Signed-off-by:

drivers/gpu/drm/drm_dp_mst_topology.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -736,6 +736,10 @@ static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
		if (msg->curchunk_idx >= msg->curchunk_len) {
		/* do CRC */
		crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
		if (crc4 != msg->chunk[msg->curchunk_len - 1])
		print_hex_dump(KERN_DEBUG, "wrong crc",
		DUMP_PREFIX_NONE, 16, 1,
		msg->chunk, msg->curchunk_len, false);
		/* copy chunk into bigger msg */
		memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
		msg->curlen += msg->curchunk_len - 1;