iio: pressure: bmp280: fix out-of-bounds access in sampling frequency lookup

Overview

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

iio: pressure: bmp280: fix out-of-bounds access in sampling frequency lookup

The sampling frequency tables store each frequency as an integer part and a fractional part in micro units. num_sampling_freq_avail is initialized to the number of flattened integer elements because read_avail() returns the table as a flat array.

bmp280_write_sampling_frequency(), however, indexes the same table as a two-dimensional array and uses num_sampling_freq_avail as the number of rows. Convert the flattened element count back to the number of rows before iterating over the table.

Affected

• Linux >= 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 < 9db6684fab228edd3b8861a172ccbce3236f027a
• Linux >= 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 < 4fd5a61e61d6899cbd45728a5fceba49a53c222d
• Linux >= 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 < 7dbb518f3328ebd9d5c6e970b4befad6deb5c7f1
• Linux >= 10b40ffba2f95cdeed47b731c5ad5ecc73e140e8 < 56c423b233b214182c58c99861899327b45b0d6c
• Linux 6.1

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.