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Subject[PATCH 4.16 138/161] media: lgdt3306a: Fix a double kfree on i2c device remove
Date
4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brad Love <brad@nextdimension.cc>

[ Upstream commit 94448e21cf08b10f7dc7acdaca387594370396b0 ]

Both lgdt33606a_release and lgdt3306a_remove kfree state, but _release is
called first, then _remove operates on states members before kfree'ing it.
This can lead to random oops/GPF/etc on USB disconnect.

Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/media/dvb-frontends/lgdt3306a.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/media/dvb-frontends/lgdt3306a.c
+++ b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -1768,7 +1768,13 @@ static void lgdt3306a_release(struct dvb
struct lgdt3306a_state *state = fe->demodulator_priv;

dbg_info("\n");
- kfree(state);
+
+ /*
+ * If state->muxc is not NULL, then we are an i2c device
+ * and lgdt3306a_remove will clean up state
+ */
+ if (!state->muxc)
+ kfree(state);
}

static const struct dvb_frontend_ops lgdt3306a_ops;

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