---
id: CVE-2022-50317
title: 'drm/bridge: megachips: Fix a null pointer dereference bug'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/bridge: megachips: Fix a null pointer dereference bug

  When removing the module we will get the following warning:

  [   31.911505] i2c-core: driver [stdp2690-ge-b85…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7649972d97fb98578fbc4a351416cf72895e7c4d <
    aaa512ad1e59f2edf8a9e4f2b167a44b24670679
  - >-
    Linux >= 16e3827904932eccfba0915f0c93b519de3536ac <
    5bc20bafcd87ba0858ab772cefc7047cb51bc249
  - >-
    Linux >= 50ad94f8654a53ec9ca3604a7a23cbaf166e0119 <
    1daf69228e310938177119c4eadcd30fc75c81e0
  - >-
    Linux >= b8d10f601f226f055df8b5368d7ea7f369136cd5 <
    877e92e9b1bdeb580b31a46061005936be902cd4
  - >-
    Linux >= 405856460d3e7aefb7c1aef047ec88fc4ef2e2a5 <
    4610e7a4111fa3f3ce27c09d6d94008c55f1cd31
  - >-
    Linux >= 11632d4aa2b3f126790e81a4415d6c23103cf8bb <
    21764467ab396d9f08921e0a5ffa1214244e1ad9
  - >-
    Linux >= 11632d4aa2b3f126790e81a4415d6c23103cf8bb <
    7371fad5cfe6eada6bb5523c895fd6074b15c2b9
  - >-
    Linux >= 11632d4aa2b3f126790e81a4415d6c23103cf8bb <
    1ff673333d46d2c1b053ebd0c1c7c7c79e36943e
  - Linux e449461989f0674f188d30494ffd3f5ba74c1a05
  - Linux >= 4.14.263 < 4.14.296
  - Linux >= 4.19.226 < 4.19.262
  - Linux >= 5.4.174 < 5.4.220
  - Linux >= 5.10.94 < 5.10.150
  - Linux >= 5.15.17 < 5.15.75
  - Linux >= 5.16.3 < 5.17
  - Linux 5.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:09:41.260250Z'
published: '2025-09-15'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:10:34.680Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50317'
references:
  - url: 'https://git.kernel.org/stable/c/aaa512ad1e59f2edf8a9e4f2b167a44b24670679'
  - url: 'https://git.kernel.org/stable/c/5bc20bafcd87ba0858ab772cefc7047cb51bc249'
  - url: 'https://git.kernel.org/stable/c/1daf69228e310938177119c4eadcd30fc75c81e0'
  - url: 'https://git.kernel.org/stable/c/877e92e9b1bdeb580b31a46061005936be902cd4'
  - url: 'https://git.kernel.org/stable/c/4610e7a4111fa3f3ce27c09d6d94008c55f1cd31'
  - url: 'https://git.kernel.org/stable/c/21764467ab396d9f08921e0a5ffa1214244e1ad9'
  - url: 'https://git.kernel.org/stable/c/7371fad5cfe6eada6bb5523c895fd6074b15c2b9'
  - url: 'https://git.kernel.org/stable/c/1ff673333d46d2c1b053ebd0c1c7c7c79e36943e'
tags:
  - cve.org
epss: 0.0016
epssPercentile: 0.0515
ingestedAt: '2026-11-05T22:38:31.725Z'
---

## Overview

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

drm/bridge: megachips: Fix a null pointer dereference bug

When removing the module we will get the following warning:

[   31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered
[   31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI
[   31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[   31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130
[   31.921825] Call Trace:
[   31.922533]  stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw]
[   31.923139]  i2c_device_remove+0x181/0x1f0

The two bridges (stdp2690, stdp4028) do not probe at the same time, so
the driver does not call ge_b850v3_resgiter() when probing, causing the
driver to try to remove the object that has not been initialized.

Fix this by checking whether both the bridges are probed.

## Affected

- `Linux >= 7649972d97fb98578fbc4a351416cf72895e7c4d < aaa512ad1e59f2edf8a9e4f2b167a44b24670679`
- `Linux >= 16e3827904932eccfba0915f0c93b519de3536ac < 5bc20bafcd87ba0858ab772cefc7047cb51bc249`
- `Linux >= 50ad94f8654a53ec9ca3604a7a23cbaf166e0119 < 1daf69228e310938177119c4eadcd30fc75c81e0`
- `Linux >= b8d10f601f226f055df8b5368d7ea7f369136cd5 < 877e92e9b1bdeb580b31a46061005936be902cd4`
- `Linux >= 405856460d3e7aefb7c1aef047ec88fc4ef2e2a5 < 4610e7a4111fa3f3ce27c09d6d94008c55f1cd31`
- `Linux >= 11632d4aa2b3f126790e81a4415d6c23103cf8bb < 21764467ab396d9f08921e0a5ffa1214244e1ad9`
- `Linux >= 11632d4aa2b3f126790e81a4415d6c23103cf8bb < 7371fad5cfe6eada6bb5523c895fd6074b15c2b9`
- `Linux >= 11632d4aa2b3f126790e81a4415d6c23103cf8bb < 1ff673333d46d2c1b053ebd0c1c7c7c79e36943e`
- `Linux e449461989f0674f188d30494ffd3f5ba74c1a05`
- `Linux >= 4.14.263 < 4.14.296`
- `Linux >= 4.19.226 < 4.19.262`
- `Linux >= 5.4.174 < 5.4.220`
- `Linux >= 5.10.94 < 5.10.150`
- `Linux >= 5.15.17 < 5.15.75`
- `Linux >= 5.16.3 < 5.17`
- `Linux 5.17`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.