CVE-2023-54279 MIPS: fw: Allow firmware to pass a empty env

In the Linux kernel, the following vulnerability has been resolved: MIPS: fw: Allow firmware to pass a empty env fwgetenv will use env entry to determine style of env, however it is legal for firmware to just pass a empty list. Check if first entry exist before running strchr to avoid null pointe...

CVE-2023-54279

CVE-2023-54279 concerns the Linux kernel MIPS fw handling when firmware passes an empty environment. The issue arises in fw_getenv, which uses an env entry to determine the style of env data; firmware may supply an empty list, risking a null pointer dereference if code path assumes a non-empty fi...