CVE-2025-39674

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

scsi: ufs: ufs-qcom: Fix ESI null pointer dereference

ESI/MSI is a performance optimization feature that provides dedicated

interrupts per MCQ hardware queue. This is optional feature and UFS MCQ

should work with and without ESI feature.

Commit e46a28cea29a ("scsi: ufs: qcom: Remove the MSI descriptor abuse")

brings a regression in ESI (Enhanced System Interrupt) configuration that

causes a null pointer dereference when Platform MSI allocation fails.

The issue occurs in when platform_device_msi_init_and_alloc_irqs() in

ufs_qcom_config_esi() fails (returns -EINVAL) but the current code uses

__free() macro for automatic cleanup free MSI resources that were never

successfully allocated.

Unable to handle kernel NULL pointer dereference at virtual

address 0000000000000008

Call trace:

mutex_lock+0xc/0x54 (P)

platform_device_msi_free_irqs_all+0x1c/0x40

ufs_qcom_config_esi+0x1d0/0x220 [ufs_qcom]

ufshcd_config_mcq+0x28/0x104

ufshcd_init+0xa3c/0xf40

ufshcd_pltfrm_init+0x504/0x7d4

ufs_qcom_probe+0x20/0x58 [ufs_qcom]

Fix by restructuring the ESI configuration to try MSI allocation first,

before any other resource allocation and instead use explicit cleanup

instead of __free() macro to avoid cleanup of unallocated resources.

Tested on SM8750 platform with MCQ enabled, both with and without

Platform ESI support.