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[86.177.210.156]) by smtp.gmail.com with ESMTPSA id p12-20020adfe60c000000b0034ccd06a6a3sm9621047wrm.18.2024.05.05.21.11.01 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 05 May 2024 21:11:01 -0700 (PDT) From: Levi Yun To: anna-maria@linutronix.de, frederic@kernel.org, tglx@linutronix.de, Markus.Elfring@web.de Cc: linux-kernel@vger.kernel.org, Levi Yun Subject: [PATCH v3] time/timgr: Fix wrong reference when level 0 group allocation failed Date: Mon, 6 May 2024 05:10:59 +0100 Message-ID: <20240506041059.86877-1-ppbuk5246@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20240505085709.82688-1-ppbuk5246@gmail.com> References: <20240505085709.82688-1-ppbuk5246@gmail.com> 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" When tmigr_setup_groups() failed level 0 group allocation, wrong reference happens on local stack array while intializing timer hierar= chy. To prevent this, Check loop condition first before initializing timer hiera= rchy. Fixes: 7ee988770326 ("timers: Implement the hierarchical pull model") Signed-off-by: Levi Yun Reviewed-by: Anna-Maria Behnsen --- v3: - Fix typo. v2: - Modify commit message. kernel/time/timer_migration.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c index ccba875d2234..84413114db5c 100644 --- a/kernel/time/timer_migration.c +++ b/kernel/time/timer_migration.c @@ -1596,7 +1596,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsig= ned int node) } while (i < tmigr_hierarchy_levels); - do { + while (i > 0) { group =3D stack[--i]; if (err < 0) { @@ -1645,7 +1645,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsig= ned int node) tmigr_connect_child_parent(child, group); } } - } while (i > 0); + } kfree(stack); -- 2.41.0