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[34.83.123.78]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc72ae70637sm3048650a12.6.2026.09.21.00.42.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Sep 2026 00:42:08 -0700 (PDT) From: Hui Peng To: Alexander Aring , Miquel Raynal , Stefan Schmidt Cc: linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Hui Peng , stable@vger.kernel.org Subject: [PATCH net v2 2/4] ieee802154: cc2520: flush fifop_irqwork before destroying buffer_mutex in probe Date: Mon, 21 Sep 2026 07:42:05 +0000 Message-ID: <20260921074207.2289391-2-benquike@gmail.com> X-Mailer: git-send-email 2.55.0.1082.g2b9226bbc0-goog In-Reply-To: <20260919213639.3316625-1-benquike@gmail.com> References: <20260919213639.3316625-1-benquike@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In cc2520_probe()'s err_hw_init path, mutex_destroy(&priv->buffer_mutex) is called before flush_work(&priv->fifop_irqwork). If fifop_irq fires after devm_request_irq() and schedules priv->fifop_irqwork before probe fails, cc2520_fifop_irqwork() can lock priv->buffer_mutex after it has already been destroyed: BUG: KASAN: slab-use-after-free in assign_work+0x2f1/0x340 Read of size 8 at addr ffff88800246b0b0 by task kworker/1:1/43 Workqueue: 0x0 (events) Call Trace: dump_stack_lvl+0x70/0xa0 print_report+0x153/0x4c6 kasan_report+0xf1/0x120 assign_work+0x2f1/0x340 worker_thread+0x2b8/0xb70 Flush priv->fifop_irqwork before mutex_destroy(&priv->buffer_mutex), matching the teardown order in cc2520_remove(). Tested in QEMU with KASAN enabled by scheduling fifop_irqwork on the cc2520_probe() error path. Fixes: ff5891b266a7 ("ieee802154: cc2520: fix FIFOP work use-after-free") Cc: stable@vger.kernel.org Assisted-by: LLM Signed-off-by: Hui Peng --- Changes in v2: - Split out as patch 2/4 and documented the probe cleanup ordering fix and Fixes: tag as requested by Miquel Raynal. drivers/net/ieee802154/cc2520.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c index 5454872..d2c8484 100644 --- a/drivers/net/ieee802154/cc2520.c +++ b/drivers/net/ieee802154/cc2520.c @@ -1153,8 +1153,8 @@ static int cc2520_probe(struct spi_device *spi) return 0; err_hw_init: - mutex_destroy(&priv->buffer_mutex); flush_work(&priv->fifop_irqwork); + mutex_destroy(&priv->buffer_mutex); return ret; } -- 2.47.3