| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.16 138/161] media: lgdt3306a: Fix a double kfree on i2c device remove | Date | Thu, 24 May 2018 11:39:23 +0200 |
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4.16-stable review patch. If anyone has any objections, please let me know.
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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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