Riskcovery

CVE-2021-47416

phy: mdio: fix memory leak

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:

phy: mdio: fix memory leak

Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic.

MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called

In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state

To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before 25e9f88c7e3cc35f5e3d3db199660d28a15df639Affected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before 2250392d930bd0d989f24d355d6355b0150256e7Affected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before f4f502a04ee1e543825af78f47eb7785015cd9f6Affected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before 2397b9e118721292429fea8807a698e71b94795fAffected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before 414bb4ead1362ef2c8592db723c017258f213988Affected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before 0d2dd40a7be61b89a7c99dae8ee96389d27b413aAffected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before 064c2616234a7394867c924b5c1303974f3a4f4dAffected
  • 46abc02175b3c246dd5141d878f565a8725060c9 to before ca6e11c337daf7925ff8a2aac8e84490a8691905Affected
LinuxLinux
  • 2.6.28Affected
  • before 2.6.28Not affected
  • 4.4.289 through 4.4.*Not affected
  • 4.9.287 through 4.9.*Not affected
  • 4.14.251 through 4.14.*Not affected
  • 4.19.211 through 4.19.*Not affected
  • 5.4.153 through 5.4.*Not affected
  • 5.10.73 through 5.10.*Not affected
  • 5.14.12 through 5.14.*Not affected
  • 5.15 and laterNot affected

References

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