From 8ac6a1a53e9f195e8c4336a7edfba2e102fc14bb Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Thu, 18 Aug 2016 04:13:42 -0300 Subject: [PATCH] [media] cec-edid: check for IEEE identifier The cec_get_edid_spa_location() function did not verify that the IEEE identifier in the Vendor Specific Data Block matched the HDMI-LLC identifier. This could result in the wrong VSDB block being returned. For example, for HDMI 2.0 EDIDs there is also a HDMI Forum VSDB. So check the IEEE identifier as well. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/cec-edid.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/media/cec-edid.c b/drivers/media/cec-edid.c index 70018247bdda..5719b991e340 100644 --- a/drivers/media/cec-edid.c +++ b/drivers/media/cec-edid.c @@ -70,7 +70,10 @@ static unsigned int cec_get_edid_spa_location(const u8 *edid, unsigned int size) u8 tag = edid[i] >> 5; u8 len = edid[i] & 0x1f; - if (tag == 3 && len >= 5 && i + len <= end) + if (tag == 3 && len >= 5 && i + len <= end && + edid[i + 1] == 0x03 && + edid[i + 2] == 0x0c && + edid[i + 3] == 0x00) return i + 4; i += len + 1; } while (i < end); -- 2.25.1