Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2022-50317

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.14.296, 4.19.262, 5.4.220, 5.10.150, 5.15.75, and 1 more
None on Exploit-DB, Metasploit or GitHub

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-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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 4.14.263 · fixed in 4.14.296; From 4.19.226 · fixed in 4.19.262; From 5.4.174 · fixed in 5.4.220; From 5.10.94 · fixed in 5.10.150; From 5.15.17 · fixed in 5.15.75; From 5.16.3 · fixed in 5.17

  • Linux Linux

    5.17

References 8

git.kernel.org