Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f3ccfda1931977b80267ba54070a1aeafa18f6ca before abfdd9e2f0f9699015d72317f74154d3e53664e6; affected f3ccfda1931977b80267ba54070a1aeafa18f6ca before 0276af2176c78771da7f311621a25d7608045827 |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 5.15.6 through 5.15.*; unaffected 5.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/abfdd9e2f0f9699015d72317f74154d3e53664e6
- https://git.kernel.org/stable/c/0276af2176c78771da7f311621a25d7608045827
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.