Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (occ) Fix division by zero in occ_show_power_1() In occ_show_power_1() case 1, the accumulator is divided by update_tag without checking for zero. If no samples have been collected yet (e.g. during early boot when the sensor block is included but hasn't been updated), update_tag is zero, causing a kernel divide-by-zero crash. The 2019 fix in commit 211186cae14d ("hwmon: (occ) Fix division by zero issue") only addressed occ_get_powr_avg() used by occ_show_power_2() and occ_show_power_a0(). This separate code path in occ_show_power_1() was missed. Fix this by reusing the existing occ_get_powr_avg() helper, which already handles the zero-sample case and uses mul_u64_u32_div() to multiply before dividing for better precision. Move the helper above occ_show_power_1() so it is visible at the call site. [groeck: Fix alignment problems reported by checkpatch]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
c10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < c7d3712362c8ab8f82f441b649d9e446e7b9aa9daffectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < 53e6175756b8c474b6247bbcea0aad3d68357475affectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < 2502684b9e835de9a992ec47c3e6c6faabe3858daffectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < 37ae8fadc74ed68e5bc364ffd17746d88e449ae3affectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < bbbefc48f6617cfb738dcff7f44beb50b5dfeb38affectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5affectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < 7b89ce0c98bf3015f493ca4285b2d1056cd8c733affectedc10e753d43ebd1d17e1c62bcee20c6124c2c7cca to < 39e2a5bf970402a8530a319cf06122e216ba57b8affected
Linux Linux
Default version status: affected
5.0affected0 to < 5.0unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.168 to ≤ 6.1.*unaffected6.6.134 to ≤ 6.6.*unaffected6.12.81 to ≤ 6.12.*unaffected6.18.22 to ≤ 6.18.*unaffected6.19.12 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d ↗
- https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475 ↗
- https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d ↗
- https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3 ↗
- https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 ↗
- https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 ↗
- https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733 ↗
- https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8 ↗