In the Linux kernel, the following vulnerability has been resolved:

iio: imu: st_lsm6dsx: fix stack leak in tagged FIFO buffer

The tagged FIFO path declares iio_buff on the stack with __aligned(8)
but no initializer, but there is a hole in the structure, which will
then leak to userspace as ST_LSM6DSX_SAMPLE_SIZE bytes (6) will be
copied, but the space between that and the timestamp are not
initialized.

Commit c14edb4d0bdc ("iio:imu:st_lsm6dsx Fix alignment and data leak
issues") moved the untagged FIFO path to a kzalloc'd buffer in hw->scan,
but for the tagged path it only added the alignment qualifier and not
the initializer :(

Fix this by just zero-initializing the structure on the stack.

https://git.kernel.org/stable/c/3147b303b8c7d9f91da4b849ece33b45048f5eaf

https://git.kernel.org/stable/c/890d0312d5f94be43eac21f5a34d3bccc60d051b

https://git.kernel.org/stable/c/babf1943a40bb5669db57d30ca16c22504b18e07

https://git.kernel.org/stable/c/c9d8e9adaa63150ef7e833480b799d0bab83a276

https://git.kernel.org/stable/c/d42ac0bfb6a16617c62a59d53706579c7fadbfa6

https://git.kernel.org/stable/c/e6bb3a49c5f9de870ea95e69775df785728e3366

https://git.kernel.org/stable/c/fe1a7f99e72ebd2880515332b79b8c256be22aca

https://git.kernel.org/stable/c/ff8d3c088b77b11782f2c3b97e37425be050e8de

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