scsi: pm80xx: Set phy->enable_completion only when we wait for it

CVE-2024-47666

What is CVE-2024-47666?

In the Linux kernel, the following vulnerability has been resolved:

scsi: pm80xx: Set phy->enable_completion only when we wait for it

pm8001_phy_control() populates the enable_completion pointer with a stack address, sends a PHY_LINK_RESET / PHY_HARD_RESET, waits 300 ms, and returns. The problem arises when a phy control response comes late. After 300 ms the pm8001_phy_control() function returns and the passed enable_completion stack address is no longer valid. Late phy control response invokes complete() on a dangling enable_completion pointer which leads to a kernel crash.

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CVE-2024-47666

CVE-2024-47666 : LINUX KERNEL UP TO 6.6.50/6.10.9 PM80XX PM8001_PHY_CONTROL STACK-BASED OVERFLOW - Cloud WAF

CVE-2024-47666 : In the Linux kernel, the following vulnerability has been resolved: scsi: pm80xx: Set phy->enable_completion only when we wait for it pm8001_phy_control() populates the enable_completion pointer with a stack address, sends a PHY_LINK_RESET / PHY_HARD_RESET, waits 300 ms, and returns...

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