linux-cve-announce - CVE-2022-49532: drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get

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Message-ID: <2025022613-CVE-2022-49532-1e14@gregkh>
Date: Wed, 26 Feb 2025 03:13:26 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49532: drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes

Description
===========

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

drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes

drm_cvt_mode may return NULL and we should check it.

This bug is found by syzkaller:

FAULT_INJECTION stacktrace:
[  168.567394] FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
[  168.567403] CPU: 1 PID: 6425 Comm: syz Kdump: loaded Not tainted 4.19.90-vhulk2201.1.0.h1035.kasan.eulerosv2r10.aarch64 #1
[  168.567406] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[  168.567408] Call trace:
[  168.567414]  dump_backtrace+0x0/0x310
[  168.567418]  show_stack+0x28/0x38
[  168.567423]  dump_stack+0xec/0x15c
[  168.567427]  should_fail+0x3ac/0x3d0
[  168.567437]  __should_failslab+0xb8/0x120
[  168.567441]  should_failslab+0x28/0xc0
[  168.567445]  kmem_cache_alloc_trace+0x50/0x640
[  168.567454]  drm_mode_create+0x40/0x90
[  168.567458]  drm_cvt_mode+0x48/0xc78
[  168.567477]  virtio_gpu_conn_get_modes+0xa8/0x140 [virtio_gpu]
[  168.567485]  drm_helper_probe_single_connector_modes+0x3a4/0xd80
[  168.567492]  drm_mode_getconnector+0x2e0/0xa70
[  168.567496]  drm_ioctl_kernel+0x11c/0x1d8
[  168.567514]  drm_ioctl+0x558/0x6d0
[  168.567522]  do_vfs_ioctl+0x160/0xf30
[  168.567525]  ksys_ioctl+0x98/0xd8
[  168.567530]  __arm64_sys_ioctl+0x50/0xc8
[  168.567536]  el0_svc_common+0xc8/0x320
[  168.567540]  el0_svc_handler+0xf8/0x160
[  168.567544]  el0_svc+0x10/0x218

KASAN stacktrace:
[  168.567561] BUG: KASAN: null-ptr-deref in virtio_gpu_conn_get_modes+0xb4/0x140 [virtio_gpu]
[  168.567565] Read of size 4 at addr 0000000000000054 by task syz/6425
[  168.567566]
[  168.567571] CPU: 1 PID: 6425 Comm: syz Kdump: loaded Not tainted 4.19.90-vhulk2201.1.0.h1035.kasan.eulerosv2r10.aarch64 #1
[  168.567573] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[  168.567575] Call trace:
[  168.567578]  dump_backtrace+0x0/0x310
[  168.567582]  show_stack+0x28/0x38
[  168.567586]  dump_stack+0xec/0x15c
[  168.567591]  kasan_report+0x244/0x2f0
[  168.567594]  __asan_load4+0x58/0xb0
[  168.567607]  virtio_gpu_conn_get_modes+0xb4/0x140 [virtio_gpu]
[  168.567612]  drm_helper_probe_single_connector_modes+0x3a4/0xd80
[  168.567617]  drm_mode_getconnector+0x2e0/0xa70
[  168.567621]  drm_ioctl_kernel+0x11c/0x1d8
[  168.567624]  drm_ioctl+0x558/0x6d0
[  168.567628]  do_vfs_ioctl+0x160/0xf30
[  168.567632]  ksys_ioctl+0x98/0xd8
[  168.567636]  __arm64_sys_ioctl+0x50/0xc8
[  168.567641]  el0_svc_common+0xc8/0x320
[  168.567645]  el0_svc_handler+0xf8/0x160
[  168.567649]  el0_svc+0x10/0x218

The Linux kernel CVE team has assigned CVE-2022-49532 to this issue.


Affected and fixed versions
===========================

	Fixed in 4.9.318 with commit e0828456578cc8ba0a69147f7ae3428392eec287
	Fixed in 4.14.283 with commit 848dd072744ea662ab3097e3c8282bee552df218
	Fixed in 4.19.247 with commit edafcad84c4134ebec4bc24b29ca4497a1184eea
	Fixed in 5.4.198 with commit f85cb059fad03a3b33a50023be91e944bb065ae8
	Fixed in 5.10.121 with commit fadc626cae99aaa1325094edc6a9e2b883f3e562
	Fixed in 5.15.46 with commit 32e10aabc287f09a148ff759bb9ce70b01b0012c
	Fixed in 5.17.14 with commit c51d00472fa54b9b05c17789ed665c17adf3a25d
	Fixed in 5.18.3 with commit 0f8bc147a963686b7351aa35d1701124ffacac08
	Fixed in 5.19 with commit 194d250cdc4a40ccbd179afd522a9e9846957402

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49532
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/virtio/virtgpu_display.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/e0828456578cc8ba0a69147f7ae3428392eec287
	https://git.kernel.org/stable/c/848dd072744ea662ab3097e3c8282bee552df218
	https://git.kernel.org/stable/c/edafcad84c4134ebec4bc24b29ca4497a1184eea
	https://git.kernel.org/stable/c/f85cb059fad03a3b33a50023be91e944bb065ae8
	https://git.kernel.org/stable/c/fadc626cae99aaa1325094edc6a9e2b883f3e562
	https://git.kernel.org/stable/c/32e10aabc287f09a148ff759bb9ce70b01b0012c
	https://git.kernel.org/stable/c/c51d00472fa54b9b05c17789ed665c17adf3a25d
	https://git.kernel.org/stable/c/0f8bc147a963686b7351aa35d1701124ffacac08
	https://git.kernel.org/stable/c/194d250cdc4a40ccbd179afd522a9e9846957402