Description
In the Linux kernel, the following vulnerability has been resolved: Input: elan_i2c - prevent division by zero and arithmetic underflow The Elan I2C touchpad driver queries the device for its physical dimensions and trace counts to calculate the device resolution and width. However, if the device firmware or device tree provides invalid zero values for x_traces or y_traces, it results in a fatal division-by-zero exception leading to a kernel panic during device probe. Add checks to ensure these parameters are non-zero before performing the division. If invalid trace values are detected, fall back to a safe default of 1. Additionally, prevent an arithmetic underflow in the touch reporting logic. Previously, if the calculated or fallback width was smaller than ETP_FWIDTH_REDUCE (90), the subtraction would underflow, resulting in a massive unsigned integer being reported to userspace. Clamp the adjusted width to a minimum of 0 to safely handle small physical dimensions and fallback scenarios. Completing the probe with safe fallback values ensures the sysfs nodes are created, keeping the firmware update path intact so a recovery firmware can be flashed to the device.
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
6696777c6506fa52b2a0282121195843ed855be6 to < 59d4cc5e7a9785e4bdc9c55273274c6b49d4b58daffected6696777c6506fa52b2a0282121195843ed855be6 to < f6d10af2036d1d4a847a74fe47ebbf93bce3c84caffected6696777c6506fa52b2a0282121195843ed855be6 to < 2f281ff0163a38fdc4cb4061f0c241e643283a5eaffected6696777c6506fa52b2a0282121195843ed855be6 to < 8c1db3418a419e788691746b9c47f863c2fd4890affected6696777c6506fa52b2a0282121195843ed855be6 to < feb4866a42ec94764c7eb58012256f6f37664727affected6696777c6506fa52b2a0282121195843ed855be6 to < 01e0317c256c560d8dcce2e9825eb6142ee34611affected6696777c6506fa52b2a0282121195843ed855be6 to < 6bac57d8fe2a077b8a85b4140eeb7999078158ebaffected6696777c6506fa52b2a0282121195843ed855be6 to < df2b818fa009c10ff6ba875a1663ff001cda9558affected
Linux Linux
Default version status: affected
3.19affected0 to < 3.19unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.96 to ≤ 6.12.*unaffected6.18.39 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/59d4cc5e7a9785e4bdc9c55273274c6b49d4b58d ↗
- https://git.kernel.org/stable/c/f6d10af2036d1d4a847a74fe47ebbf93bce3c84c ↗
- https://git.kernel.org/stable/c/2f281ff0163a38fdc4cb4061f0c241e643283a5e ↗
- https://git.kernel.org/stable/c/8c1db3418a419e788691746b9c47f863c2fd4890 ↗
- https://git.kernel.org/stable/c/feb4866a42ec94764c7eb58012256f6f37664727 ↗
- https://git.kernel.org/stable/c/01e0317c256c560d8dcce2e9825eb6142ee34611 ↗
- https://git.kernel.org/stable/c/6bac57d8fe2a077b8a85b4140eeb7999078158eb ↗
- https://git.kernel.org/stable/c/df2b818fa009c10ff6ba875a1663ff001cda9558 ↗