CVE-2022-49612 (GCVE-0-2022-49612)
Vulnerability from cvelistv5
Published
2025-02-26 02:23
Modified
2025-05-04 08:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: core: Fix boundary conditions in interpolation The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple handle boundary conditions incorrectly. The change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283 ("power: supply: core: Use library interpolation"). There are two issues: First, the lines "high = i - 1" and "high = i" in ocv2cap have the wrong order compared to temp2resist. As a consequence, ocv2cap sets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read. Second, the logic of temp2resist is also not correct. Consider the case table[] = {{20, 100}, {10, 80}, {0, 60}}. For temp=5, we expect a resistance of 70% by interpolation. However, temp2resist sets high=low=2 and returns 60.
References
Impacted products
Vendor Product Version
Linux Linux Version: a4585ba2050f460f749bbaf2b67bd56c41e30283
Version: a4585ba2050f460f749bbaf2b67bd56c41e30283
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            "drivers/power/supply/power_supply_core.c"
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}


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