In the Linux kernel, the following vulnerability has been resolved: bcache: Fix bchbtreenodealloc to make the failure behavior consistent In some specific situations, the return value of _bchbtreenodealloc may be NULL. This may lead to a potential NULL pointer dereference in caller function like a calling chain : btreesplit->bchbtreenodealloc->bchbtreenodealloc. Fix it by initializing the return value in _bchbtreenodealloc.