Linux Kernel SPI NOR Division by Zero Vulnerability

A division by zero vulnerability has been identified in the Linux kernel's SPI NOR handling. When there is no dummy cycle in the SPI NOR commands, both the dummy bus cycle bytes and width are zero. This situation triggers a CPU warning for division by zero. The vulnerability has been addressed by modifying the code to return zero instead of performing the division, thereby avoiding the warning.

Impact

Exploitation of this vulnerability could lead to a division by zero error, causing a warning from the CPU. In some cases, such division by zero errors can be exploited to cause a denial of service by crashing the system or application.