CVE-2025-39921 - spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback

CVE-2025-39921 - spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback

https://cvefeed.io/rssfeed/latest.atom / Wed, 10/01/2025 - 11:41
CVE ID : CVE-2025-39921
Published : Oct. 1, 2025, 8:15 a.m. | 1 hour, 17 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback In commit 13529647743d9 ("spi: microchip-core-qspi: Support per spi-mem operation frequency switches") the logic for checking the viability of op->max_freq in mchp_coreqspi_setup_clock() was copied into mchp_coreqspi_supports_op(). Unfortunately, op->max_freq is not valid when this function is called during probe but is instead zero. Accordingly, baud_rate_val is calculated to be INT_MAX due to division by zero, causing probe of the attached memory device to fail. Seemingly spi-microchip-core-qspi was the only driver that had such a modification made to its supports_op callback when the per_op_freq capability was added, so just remove it to restore prior functionality.
Severity: 0.0 | NA
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