cve-2021-47556
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2024-11-04 12:08
Severity ?
Summary
ethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0276af2176c78771da7f311621a25d7608045827Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abfdd9e2f0f9699015d72317f74154d3e53664e6Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce()\n\nethtool_set_coalesce() now uses both the .get_coalesce() and\n.set_coalesce() callbacks. But the check for their availability is\nbuggy, so changing the coalesce settings on a device where the driver\nprovides only _one_ of the callbacks results in a NULL pointer\ndereference instead of an -EOPNOTSUPP.\n\nFix the condition so that the availability of both callbacks is\nensured. This also matches the netlink code.\n\nNote that reproducing this requires some effort - it only affects the\nlegacy ioctl path, and needs a specific combination of driver options:\n- have .get_coalesce() and .coalesce_supported but no\n .set_coalesce(), or\n- have .set_coalesce() but no .get_coalesce(). Here eg. ethtool doesn\u0027t\n  cause the crash as it first attempts to call ethtool_get_coalesce()\n  and bails out on error."
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    "dateReserved": "2024-05-24T15:02:54.833Z",
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