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iio: proximity: as3935: fix buffer stack trashing

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commit 37b1ba2c68 upstream.

Buffer wasn't of a valid size to allow the timestamp, and correct padding.
This patchset also moves the buffer off the stack, and onto the heap.

Cc: george.mccollister@gmail.com
Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matt Ranostay 2016-05-21 20:01:03 -07:00 • committed by Greg Kroah-Hartman
commit c00a4987fa
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/proximity/as3935.c
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@ -64,6 +64,7 @@ struct as3935_state {
struct delayed_work work;
u32 tune_cap;
u8 buffer[16]; /* 8-bit data + 56-bit padding + 64-bit timestamp */
u8 buf[2] ____cacheline_aligned;
};
@ -212,9 +213,10 @@ static irqreturn_t as3935_trigger_handler(int irq, void *private)
ret = as3935_read(st, AS3935_DATA, &val);
if (ret)
goto err_read;
val &= AS3935_DATA_MASK;
iio_push_to_buffers_with_timestamp(indio_dev, &val, pf->timestamp);
st->buffer[0] = val & AS3935_DATA_MASK;
iio_push_to_buffers_with_timestamp(indio_dev, &st->buffer,
pf->timestamp);
err_read:
iio_trigger_notify_done(indio_dev->trig);