Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device ethnl_req_get_phydev() is used to lookup a phy_device, in the case an ethtool netlink command targets a specific phydev within a netdev's topology. It takes as a parameter a const struct nlattr *header that's used for error handling : if (!phydev) { NL_SET_ERR_MSG_ATTR(extack, header, "no phy matching phyindex"); return ERR_PTR(-ENODEV); } In the notify path after a ->set operation however, there's no request attributes available. The typical callsite for the above function looks like: phydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_XXX_HEADER], info->extack); So, when tb is NULL (such as in the ethnl notify path), we have a nice crash. It turns out that there's only the PLCA command that is in that case, as the other phydev-specific commands don't have a notification. This commit fixes the crash by passing the cmd index and the nlattr array separately, allowing NULL-checking it directly inside the helper.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c15e065b46dc4e19837275b826c1960d55564abd before 639c70352958735addbba5ae7dd65985da96e061; affected c15e065b46dc4e19837275b826c1960d55564abd before 1f458fa42c29144cef280e05bc49fc21b873d897; affected c15e065b46dc4e19837275b826c1960d55564abd before 637399bf7e77797811adf340090b561a8f9d1213 |
| Linux / Linux | affected 6.12; unaffected 0 before 6.12; unaffected 6.12.19 through 6.12.*; unaffected 6.13.7 through 6.13.*; unaffected 6.14 through * |
CWE
No CWE identifiers supplied.