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Mon, 09 Mar 2026 01:26:30 -0700 (PDT) Received: from lima-ubuntu.hz.ali.com ([47.246.98.213]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-485276bc6bbsm235489635e9.15.2026.03.09.01.26.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2026 01:26:30 -0700 (PDT) From: Qing Wang To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Haocheng Yu Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Qing Wang , syzbot+196a82fd904572696b3c@syzkaller.appspotmail.com Subject: [PATCH] perf: Fix deadlock in perf_mmap() Date: Mon, 9 Mar 2026 16:25:48 +0800 Message-Id: <20260309082548.3084264-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There is a possible deadlock in perf_mmap() if mmap_range() fails then perf_mmap_close() is called while holding event->mmap_mutex. Since perf_mmap_close() also acquire the same mutex, this result in self-deadlock. Fix this by moving the cleanup(perf_mmap_close()) outside the scope of scoped_guard(mutex, &event->mmap_mutex). Fixes: 77de62ad3de3 ("perf/core: Fix refcount bug and potential UAF in perf= _mmap") Reported-by: syzbot+196a82fd904572696b3c@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D196a82fd904572696b3c Signed-off-by: Qing Wang --- kernel/events/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 1f5699b339ec..e5ce03ce926d 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7485,9 +7485,12 @@ static int perf_mmap(struct file *file, struct vm_ar= ea_struct *vma) */ ret =3D map_range(event->rb, vma); if (ret) - perf_mmap_close(vma); + goto out_close; } + return 0; =20 +out_close: + perf_mmap_close(vma); return ret; } =20 --=20 2.34.1