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([2402:3a80:1e0c:62a:e3f8:4544:2200:cbc8]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7f4c22851besm5783941b3a.11.2025.12.12.08.51.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Dec 2025 08:51:24 -0800 (PST) From: Tinu K Cheriya To: peterz@infradead.org Cc: acme@kernel.org, tglx@linutronix.de, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Tinu K Cheriya Subject: [PATCH] perf/x86: Fix NULL dereference in handle_pmi_common() Date: Fri, 12 Dec 2025 22:21:12 +0530 Message-Id: <20251212165112.855537-1-tinuk11c@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit syzbot reported a NULL pointer dereference in handle_pmi_common() when the event pointer retrieved from cpuc->events[] is NULL but is_pebs_counter_event_group() is called unconditionally. Add a defensive NULL check before calling is_pebs_counter_event_group(). bug:220855 Signed-off-by: Tinu K Cheriya --- arch/x86/events/intel/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index 1e3ce060d..ee693946d 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -3397,7 +3397,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status) * * The PEBS buffer has to be drained before handling the A-PMI */ - if(!event) + if (!event) continue; if (is_pebs_counter_event_group(event)) static_call(x86_pmu_drain_pebs)(regs, &data); -- 2.34.1