Linux Kernel SCSI UFS NULL Pointer Dereference Vulnerability

A vulnerability in the Linux kernel's SCSI UFS (Universal Flash Storage) core has been addressed by adding a NULL pointer check in the 'ufshcd_mcq_compl_pending_transfer()' function. This vulnerability could potentially lead to a NULL pointer dereference, a common programming error that can cause a system to crash or behave unexpectedly. The issue was resolved by ensuring that the hardware queue pointer returned by 'ufshcd_mcq_req_to_hwq()' is not NULL before it is used. This fix is similar to a previous correction that addressed a racing issue in the UFS abort handling.

Impact

The vulnerability could lead to a NULL pointer dereference, causing a system crash or unpredictable behavior.