Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  net: ch9200: fix uninitialised access during mii_nway_restart  In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read():          if (err == size) {                 memcpy(data, buf, size);         }  If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read():          return (buff0]  ( buff[1) << 8);  The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff".  To fix this we should check the return value of control_read() and return early on error.

CREATE(Triage):(User=lchen-cn) CVE-2025-38086 (https://nvd.nist.gov/vuln/detail/CVE-2025-38086)