In the Linux kernel, the following vulnerability has been resolved: perf/core: Exit early on perfmmap() fail When perfmmap() fails to allocate a buffer, it still invokes the eventmapped() callback of the related event. On X86 this might increase the perfrdpmcallowed reference counter. But nothing undoes this as perfmmap_close() is never called in this case, which causes another reference count leak. Return early on failure to prevent that.