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

Official 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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/4ad071e3d57967f7ab483aed0687468bc1d9e9ce
• https://git.kernel.org/stable/c/ac8a13f35d5b8996582b3f97b924838a5c570c18
• https://git.kernel.org/stable/c/89e7353f522f5cf70cb48c01ce2dcdcb275b8022