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[34.83.123.78]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39e6cabb771sm13015876a91.9.2026.09.21.00.42.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Sep 2026 00:42:05 -0700 (PDT) From: Hui Peng To: Harry Morris , 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 1/3] ieee802154: ca8210: prevent stack buffer overflow in ca8210_rx_done() Date: Mon, 21 Sep 2026 07:42:03 +0000 Message-ID: <20260921074205.2289211-1-benquike@gmail.com> X-Mailer: git-send-email 2.55.0.1082.g2b9226bbc0-goog In-Reply-To: <20260919213637.3316595-1-benquike@gmail.com> References: <20260919213637.3316595-1-benquike@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In ca8210_rx_done(), the packet length len = buf[1] + 2 is only checked against CA8210_SPI_BUF_SIZE (256). When buf[0] & SPI_SYN is set and priv->sync_command_response is non-NULL, memcpy() copies up to 256 bytes into priv->sync_command_response, which points to a struct mac_message object (sizeof(struct mac_message) = 250 bytes) on the synchronous caller's stack, overflowing the stack buffer by up to 6 bytes: BUG: KASAN: stack-out-of-bounds in ca8210_rx_done+0xc4/0xe0 Write of size 256 at addr ffff888001907660 by task init/1 Call Trace: dump_stack_lvl+0x70/0xa0 print_report+0x153/0x4c6 kasan_report+0xf1/0x120 kasan_check_range+0x125/0x200 __asan_memcpy+0x3c/0x60 ca8210_rx_done+0xc4/0xe0 ca8210_spi_exchange+0x12e/0x190 ... The buggy address belongs to stack of task init/1 and is located at offset 32 in frame: ca8210_spi_exchange+0x0/0x190 This frame has 1 object: [32, 282) 'response' Bound the synchronous response memcpy() length to min_t(size_t, len, sizeof(struct mac_message)). Tested in QEMU with KASAN enabled by passing a 256-byte SPI_SYN response into ca8210_rx_done(). Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver") Cc: stable@vger.kernel.org Assisted-by: LLM Signed-off-by: Hui Peng --- Changes in v2: - Split the ca8210 fixes into three single-issue patches (1/3..3/3). drivers/net/ieee802154/ca8210.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c index 01af4f9..c009930 100644 --- a/drivers/net/ieee802154/ca8210.c +++ b/drivers/net/ieee802154/ca8210.c @@ -697,7 +697,8 @@ static void ca8210_rx_done(struct cas_control *cas_ctl) if (buf[0] & SPI_SYN) { if (priv->sync_command_response) { - memcpy(priv->sync_command_response, buf, len); + memcpy(priv->sync_command_response, buf, + min_t(size_t, len, sizeof(struct mac_message))); complete(&priv->sync_exchange_complete); } else { if (cascoda_api_upstream) -- 2.47.3