iio: backend: fix out-of-bound write

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The buffer is set to 80 character. If a caller write more characters,
count is truncated to the max available space in "simple_write_to_buffer".
But afterwards a string terminator is written to the buffer at offset count
without boundary check. The zero termination is written OUT-OF-BOUND.

Add a check that the given buffer is smaller then the buffer to prevent.

Fixes: 035b498921 ("iio: backend: make sure to NULL terminate stack buffer")
Signed-off-by: Markus Burri <markus.burri@mt.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250508130612.82270-2-markus.burri@mt.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Markus Burri 2025-05-08 15:06:07 +02:00 • committed by Jonathan Cameron

parent 19272b37aa

commit da9374819e

1 changed files with 4 additions and 1 deletions

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drivers/iio/industrialio-backend.c

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