media: coda: fix memory corruption in case more than 32 instances are opened
[ Upstream commit 649cfc2bdfeeb98ff7d8fdff0af3f8fb9c8da50f ] The ffz() return value is undefined if the instance mask does not contain any zeros. If it returned 32, the following set_bit would corrupt the debugfs_root pointer. Switch to IDA for context index allocation. This also removes the artificial 32 instance limit for all except CodaDx6. Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de> Signed-off-by: NHans Verkuil <hansverk@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: NSasha Levin <sashal@kernel.org>
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