Affected: Linux

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: 00010246 RAX: ffffffffc1a21a60 RBX: ffffffff899567a0 RCX: 0000000000000000 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000000000000 RBP: ff1bda1f7c21e800 R08: 0000000000000000 R09: ff1c823ac2307670 R10: ff1c823ac2307668 R11: ffffffff8a9e7b68 R12: 0000000000000000 R13: 0000000000000000 R14: ff1bda1f43e341a0 R15: 00000000ffffffea FS: 00007f56eba7c740(0000) GS:ff1bda269f800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 C…