CVE-2021-47384

Summary

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

hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field

If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 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 multi-line alignments]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcf48d17623281c2b3185030ed23f148bd47e15de < 6cb01fe630eaffc5a2c3f7364436caddba286623affected
LinuxLinuxcf48d17623281c2b3185030ed23f148bd47e15de < 7c4fd5de39f273626a2b0f3a446d2cc85cd47616affected
LinuxLinuxcf48d17623281c2b3185030ed23f148bd47e15de < 746011193f44f97f8784edcf8327c587946745fcaffected
LinuxLinuxcf48d17623281c2b3185030ed23f148bd47e15de < dd4d747ef05addab887dc8ff0d6ab9860bbcd783affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.4.151 <= 5.4.*unaffected
LinuxLinux5.10.71 <= 5.10.*unaffected
LinuxLinux5.14.10 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References