CVE-2025-21888

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

RDMA/mlx5: Fix a WARN during dereg_mr for DM type

Memory regions (MR) of type DM (device memory) do not have an associated

umem.

In the __mlx5_ib_dereg_mr() -> mlx5_free_priv_descs() flow, the code

incorrectly takes the wrong branch, attempting to call

dma_unmap_single() on a DMA address that is not mapped.

This results in a WARN [1], as shown below.

The issue is resolved by properly accounting for the DM type and

ensuring the correct branch is selected in mlx5_free_priv_descs().

[1]

WARNING: CPU: 12 PID: 1346 at drivers/iommu/dma-iommu.c:1230 iommu_dma_unmap_page+0x79/0x90

Modules linked in: ip6table_mangle ip6table_nat ip6table_filter ip6_tables iptable_mangle xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xt_addrtype iptable_nat nf_nat br_netfilter rpcsec_gss_krb5 auth_rpcgss oid_registry ovelay rpcrdma rdma_ucm ib_iser libiscsi scsi_transport_iscsi ib_umad rdma_cm ib_ipoib iw_cm ib_cm mlx5_ib ib_uverbs ib_core fuse mlx5_core

CPU: 12 UID: 0 PID: 1346 Comm: ibv_rc_pingpong Not tainted 6.12.0-rc7+ #1631

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

RIP: 0010:iommu_dma_unmap_page+0x79/0x90

Code: 2b 49 3b 29 72 26 49 3b 69 08 73 20 4d 89 f0 44 89 e9 4c 89 e2 48 89 ee 48 89 df 5b 5d 41 5c 41 5d 41 5e 41 5f e9 07 b8 88 ff <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 66 0f 1f 44 00

RSP: 0018:ffffc90001913a10 EFLAGS: 00010246

RAX: 0000000000000000 RBX: ffff88810194b0a8 RCX: 0000000000000000

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001

RBP: ffff88810194b0a8 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000

R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000

FS: 00007f537abdd740(0000) GS:ffff88885fb00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f537aeb8000 CR3: 000000010c248001 CR4: 0000000000372eb0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

? __warn+0x84/0x190

? iommu_dma_unmap_page+0x79/0x90

? report_bug+0xf8/0x1c0

? handle_bug+0x55/0x90

? exc_invalid_op+0x13/0x60

? asm_exc_invalid_op+0x16/0x20

? iommu_dma_unmap_page+0x79/0x90

dma_unmap_page_attrs+0xe6/0x290

mlx5_free_priv_descs+0xb0/0xe0 [mlx5_ib]

__mlx5_ib_dereg_mr+0x37e/0x520 [mlx5_ib]

? _raw_spin_unlock_irq+0x24/0x40

? wait_for_completion+0xfe/0x130

? rdma_restrack_put+0x63/0xe0 [ib_core]

ib_dereg_mr_user+0x5f/0x120 [ib_core]

? lock_release+0xc6/0x280

destroy_hw_idr_uobject+0x1d/0x60 [ib_uverbs]

uverbs_destroy_uobject+0x58/0x1d0 [ib_uverbs]

uobj_destroy+0x3f/0x70 [ib_uverbs]

ib_uverbs_cmd_verbs+0x3e4/0xbb0 [ib_uverbs]

? __pfx_uverbs_destroy_def_handler+0x10/0x10 [ib_uverbs]

? lock_acquire+0xc1/0x2f0

? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs]

? ib_uverbs_ioctl+0x116/0x170 [ib_uverbs]

? lock_release+0xc6/0x280

ib_uverbs_ioctl+0xe7/0x170 [ib_uverbs]

? ib_uverbs_ioctl+0xcb/0x170 [ib_uverbs]

__x64_sys_ioctl+0x1b0/0xa70

do_syscall_64+0x6b/0x140

entry_SYSCALL_64_after_hwframe+0x76/0x7e

RIP: 0033:0x7f537adaf17b

Code: 0f 1e fa 48 8b 05 1d ad 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed ac 0c 00 f7 d8 64 89 01 48

RSP: 002b:00007ffff218f0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010

RAX: ffffffffffffffda RBX: 00007ffff218f1d8 RCX: 00007f537adaf17b

RDX: 00007ffff218f1c0 RSI: 00000000c0181b01 RDI: 0000000000000003

RBP: 00007ffff218f1a0 R08: 00007f537aa8d010 R09: 0000561ee2e4f270

R10: 00007f537aace3a8 R11: 0000000000000246 R12: 00007ffff218f190

R13: 000000000000001c R14: 0000561ee2e4d7c0 R15: 00007ffff218f450

</TASK>