In the Linux kernel, the following vulnerability has been resolved:
ethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce()
ethtool_set_coalesce() now uses both the .get_coalesce() and
.set_coalesce() callbacks. But the check for their availability is
buggy, so changing the coalesce settings on a device where the driver
provides only _one_ of the callbacks results in a NULL pointer
dereference instead of an -EOPNOTSUPP.
Fix the condition so that the availability of both callbacks is
ensured. This also matches the netlink code.
Note that reproducing this requires some effort - it only affects the
legacy ioctl path, and needs a specific combination of driver options:
- have .get_coalesce() and .coalesce_supported but no
.set_coalesce(), or
- have .set_coalesce() but no .get_coalesce(). Here eg. ethtool doesn't
cause the crash as it first attempts to call ethtool_get_coalesce()
and bails out on error.
Metrics
Affected Vendors & Products
References
History
Thu, 12 Sep 2024 20:30:00 +0000
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Wed, 11 Sep 2024 13:30:00 +0000
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-05-24T15:09:57.983Z
Updated: 2024-09-11T17:33:20.673Z
Reserved: 2024-05-24T15:02:54.833Z
Link: CVE-2021-47556
Vulnrichment
Updated: 2024-08-04T05:39:59.696Z
NVD
Status : Analyzed
Published: 2024-05-24T15:15:20.320
Modified: 2024-06-10T19:23:01.133
Link: CVE-2021-47556
Redhat