Riskcovery

CVE-2021-47385

hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

State
Published
Severity
Not scored
Published
May 21, 2024
Updated
May 11, 2026
Reserved
May 21, 2024

Read the record on cve.org

Description

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

hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients().

The patch fixes possible NULL pointer dereference by removing lm75[].

Found by Linux Driver Verification project (linuxtesting.org).

[groeck: Dropped unnecessary continuation lines, fixed multipline alignment]

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f64211151db4269341ee6432ce832ae3756725ad to before 200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1Affected
  • f64211151db4269341ee6432ce832ae3756725ad to before 1499bb2c3a87a2efea0065adab2bd66badee61c3Affected
  • f64211151db4269341ee6432ce832ae3756725ad to before 24af1fe376e22c42238a4a604d31e46c486876c3Affected
  • f64211151db4269341ee6432ce832ae3756725ad to before 0f36b88173f028e372668ae040ab1a496834d278Affected
LinuxLinux
  • 5.4Affected
  • before 5.4Not affected
  • 5.4.151 through 5.4.*Not affected
  • 5.10.71 through 5.10.*Not affected
  • 5.14.10 through 5.14.*Not affected
  • 5.15 and laterNot affected

References

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