CVE-2021-47280 (GCVE-0-2021-47280)
Vulnerability from cvelistv5
Published
2024-05-21 14:20
Modified
2025-05-04 07:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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This is\\nbecause another process had acquired the device\u0027s master mutex in\\ndrm_setmaster_ioctl(), then overwrote fpriv-\u003emaster in\\ndrm_new_set_master(). The old value of fpriv-\u003emaster was subsequently\\nfreed before the mutex was unlocked.\\n\\nTo fix this, we lock the device\u0027s master mutex before retrieving the\\npointer from from fpriv-\u003emaster. 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      "cveMetadata": "{\"cveId\": \"CVE-2021-47280\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:07:47.801Z\", \"dateReserved\": \"2024-05-21T13:27:52.128Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:20:06.852Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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