5.5

CVE-2022-50317

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.14.263 < 4.14.296
Linux ≫ Linux Kernel Version >= 4.19.226 < 4.19.262
Linux ≫ Linux Kernel Version >= 5.4.174 < 5.4.220
Linux ≫ Linux Kernel Version >= 5.10.94 < 5.10.150
Linux ≫ Linux Kernel Version >= 5.15.17 < 5.15.75
Linux ≫ Linux Kernel Version >= 5.16.3 < 5.19.17
Linux ≫ Linux Kernel Version >= 6.0 < 6.0.3
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.041
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/aaa512ad1e59f2edf8a9e4f2b167a44b24670679
Patch
https://git.kernel.org/stable/c/5bc20bafcd87ba0858ab772cefc7047cb51bc249
Patch
https://git.kernel.org/stable/c/1daf69228e310938177119c4eadcd30fc75c81e0
Patch
https://git.kernel.org/stable/c/877e92e9b1bdeb580b31a46061005936be902cd4
Patch
https://git.kernel.org/stable/c/4610e7a4111fa3f3ce27c09d6d94008c55f1cd31
Patch
https://git.kernel.org/stable/c/21764467ab396d9f08921e0a5ffa1214244e1ad9
Patch
https://git.kernel.org/stable/c/7371fad5cfe6eada6bb5523c895fd6074b15c2b9
Patch
https://git.kernel.org/stable/c/1ff673333d46d2c1b053ebd0c1c7c7c79e36943e
Patch