From: Thomas Gleixner <tglx@linutronix.de> stable inclusion from stable-v6.6.102 commit f41e9eba77bf97626e04296dc5677d02816d2432 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ICTZVY CVE: CVE-2025-38565 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 07091aade394f690e7b655578140ef84d0e8d7b0 upstream. When perf_mmap() fails to allocate a buffer, it still invokes the event_mapped() callback of the related event. On X86 this might increase the perf_rdpmc_allowed reference counter. But nothing undoes this as perf_mmap_close() is never called in this case, which causes another reference count leak. Return early on failure to prevent that. Fixes: 1e0fb9ec679c ("perf/core: Add pmu callbacks to track event mapping and unmapping") Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Luo Gengkun <luogengkun@huaweicloud.com> --- kernel/events/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 1ca8ecdabbe3..e1125d158c74 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6261,6 +6261,9 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma) mutex_unlock(aux_mutex); mutex_unlock(&event->mmap_mutex); + if (ret) + return ret; + /* * Since pinned accounting is per vm we cannot allow fork() to copy our * vma. -- 2.34.1