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Mon, 09 Sep 2024 03:39:01 -0700 (PDT) Received: from kernelexploit-virtual-machine.localdomain ([121.185.186.233]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2db04987403sm4151891a91.48.2024.09.09.03.38.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 03:39:00 -0700 (PDT) From: Jeongjun Park To: toke@toke.dk, kvalo@kernel.org Cc: Sujith.Manoharan@atheros.com, senthilkumar@atheros.com, vasanth@atheros.com, linville@tuxdriver.com, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Jeongjun Park Subject: [PATCH v2] wifi: ath9k: add range check for conn_rsp_epid in htc_connect_service() Date: Mon, 9 Sep 2024 19:38:55 +0900 Message-Id: <20240909103855.68006-1-aha310510@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" I found the following bug in my fuzzer: UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath9k/htc_hs= t.c:26:51 index 255 is out of range for type 'htc_endpoint [22]' CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.11.0-rc6-dirty #14 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/0= 1/2014 Workqueue: events request_firmware_work_func Call Trace: dump_stack_lvl+0x180/0x1b0 __ubsan_handle_out_of_bounds+0xd4/0x130 htc_issue_send.constprop.0+0x20c/0x230 ? _raw_spin_unlock_irqrestore+0x3c/0x70 ath9k_wmi_cmd+0x41d/0x610 ? mark_held_locks+0x9f/0xe0 ... Since this bug has been confirmed to be caused by insufficient verification=20 of conn_rsp_epid, I think it would be appropriate to add a range check for=20 conn_rsp_epid to htc_connect_service() to prevent the bug from occurring. Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") Signed-off-by: Jeongjun Park Acked-by: Toke H=C3=B8iland-J=C3=B8rgensen --- drivers/net/wireless/ath/ath9k/htc_hst.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireles= s/ath/ath9k/htc_hst.c index eb631fd3336d..b5257b2b4aa5 100644 --- a/drivers/net/wireless/ath/ath9k/htc_hst.c +++ b/drivers/net/wireless/ath/ath9k/htc_hst.c @@ -294,6 +294,9 @@ int htc_connect_service(struct htc_target *target, return -ETIMEDOUT; } =20 + if (target->conn_rsp_epid < 0 || target->conn_rsp_epid >=3D ENDPOINT_MAX) + return -EINVAL; + *conn_rsp_epid =3D target->conn_rsp_epid; return 0; err: --