CVE-2024-47687

/// Technical description

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

vdpa/mlx5: Fix invalid mr resource destroy

Certain error paths from mlx5_vdpa_dev_add() can end up releasing mr

resources which never got initialized in the first place.

This patch adds the missing check in mlx5_vdpa_destroy_mr_resources()

to block releasing non-initialized mr resources.

Reference trace:

mlx5_core 0000:08:00.2: mlx5_vdpa_dev_add:3274:(pid 2700) warning: No mac address provisioned?

BUG: kernel NULL pointer dereference, address: 0000000000000000

#PF: supervisor read access in kernel mode

#PF: error_code(0x0000) - not-present page

PGD 140216067 P4D 0

Oops: 0000 [#1] PREEMPT SMP NOPTI

CPU: 8 PID: 2700 Comm: vdpa Kdump: loaded Not tainted 5.14.0-496.el9.x86_64 #1

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014

RIP: 0010:vhost_iotlb_del_range+0xf/0xe0 [vhost_iotlb]

Code: [...]

RSP: 0018:ff1c823ac23077f0 EFLAGS: 000102

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References