Hi there,
My name is Shaobo He and I am a graduate student at University of Utah.
I am applying a static analysis tool to the Linux device drivers and got
an error trace of null pointer dereference in
drivers/input/touchscreen/ad7879-spi.c staring from
`ad7879_spi_multi_read`: it calls `ad7879_spi_xfer` with the argument
`tx_buf` being NULL, which gets dereferenced at line 52 given the
argument `count` being 1
(http://lxr.free-electrons.com/source/drivers/input/touchscreen/ad7879-spi.c#L52).
As you can see, the error trace is only plausible since it depends on
certain conditions. To be more specific, is it possible for the count
argument to be 1. Therefore, I was wondering if you could help me
confirm it since you are one of the authors of this driver.
Thanks for your time. I am looking forward to your reply.
Best,
Shaobo
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