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UPSTREAM: [media] cec-edid: check for IEEE identifier

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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 <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
(cherry picked from commit 8ac6a1a53e)

Change-Id: I982189124b438906e34f57a3fdd9b6da4c202f19
Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>
This commit is contained in:
Hans Verkuil 2016-08-18 04:13:42 -03:00 committed by Tao Huang
parent f5289f0611
commit 7da8897545
1 changed files with 4 additions and 1 deletions
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5
drivers/media/cec-edid.c
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@ -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);