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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33bf5a6a175sm9590192eec.9.2026.09.16.11.40.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Sep 2026 11:40:36 -0700 (PDT) Message-ID: <8c2dbacf-63ec-428c-b283-50198579cb89@oss.qualcomm.com> Date: Wed, 16 Sep 2026 11:40:35 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] wifi: ath9k: reject short WMI command responses To: Pengpeng Hou , =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hy?= =?UTF-8?Q?gensen?= Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260814075837.20005-1-pengpeng@iscas.ac.cn> From: Jeff Johnson Content-Language: en-US In-Reply-To: <20260814075837.20005-1-pengpeng@iscas.ac.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE2MDI1NyBTYWx0ZWRfX5eBWyBjqZ9gt MaDSsRMw6PDv9aJrtS+qsAF0kuov3kz6lvkp/cbt5srPkeB/YRoAeoSdXeWEc9V0llZzwtX9pNF bqDFuzkPZ1DOXPQWdcnxxt1PWZU2SSAJVuUGYqc9xoGs+gjxDWWa3he4Tg2PHBj5POuSnSNYxA/ OSmAQA3z3GZYq+D4HgNcX0NTxPQL9XIyln0V8wkGYSTzMh8dQia3Pp8Olny5OK1t0tdQbKNo+9U PMRP+3pDW1bYn1mDKsNQhuEoO+CH5vMhdwKFjvs0+gOVI7++1VZt3Vc/pJGqhVAEjWiNNEBay8b baFTuLIYI7wu/Of1gjBojuV9CMcSEZBWZKezdVv3E4vWDqKz5ntAwmAIaX2PWO932oA4loSWLst oG2R22KL1sm18bAx4VUniI/Qlvx+EJzkav2TxXqo8nnT65Jo4d8Q7Htupc7vXnf2bJvHqdTYjwF nJpcspm1G9Ncyd3Fr2Q== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE2MDI1NyBTYWx0ZWRfXyQJB0TE1Xljz c4x81wMIUjx5KJuNelYNjrWknvsxJORNi/vbHoq78ypQHt04yO0PbdYsCRQjUfo+B8QnJyVHl7m EEBpBV/GXFZvdNeybEz75wrlko8wcTQ= X-Proofpoint-ORIG-GUID: f5h2SIAzCNLNIId79PBezDg5VolQTnke X-Authority-Analysis: v=2.4 cv=K7O3jCWI c=1 sm=1 tr=0 ts=6aaae2a6 cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=VwQbUJbxAAAA:8 a=gn-qI1OdAbPOfbCAwS8A:9 a=QEXdDO2ut3YA:10 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-GUID: f5h2SIAzCNLNIId79PBezDg5VolQTnke X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-16_03,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 phishscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 adultscore=0 suspectscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609160257 On 8/14/2026 12:58 AM, Pengpeng Hou wrote: > ath9k_wmi_rsp_callback() removes the validated WMI header and copies > the number of bytes expected by the waiting command into its response > buffer. A device response shorter than that expectation can therefore > be read beyond the skb payload. > > Record -EMSGSIZE for a short response, complete the waiter, and return > the stored status from the command path. This also prevents callers from > consuming stale response bytes as a successful reply. > > Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") > Assisted-by: Codex:gpt-5 > Signed-off-by: Pengpeng Hou > --- > Changes since v1: https://lore.kernel.org/all/20260704011405.55089-1-pengpeng@iscas.ac.cn/ > - return a stored response error to the waiting command > - retain acceptance of replies longer than the requested prefix > - recheck callback synchronization under the existing WMI lock > > The WMI callback and waiter synchronization were reviewed statically; no > ath9k firmware fault injection was performed. > > drivers/net/wireless/ath/ath9k/wmi.c | 17 +++++++++++++++-- > drivers/net/wireless/ath/ath9k/wmi.h | 1 + > 2 files changed, 16 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/wireless/ath/ath9k/wmi.c b/drivers/net/wireless/ath/ath9k/wmi.c > index 284e8c13b043..06d9975f9717 100644 > --- a/drivers/net/wireless/ath/ath9k/wmi.c > +++ b/drivers/net/wireless/ath/ath9k/wmi.c > @@ -206,8 +206,16 @@ static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb) > { > skb_pull(skb, sizeof(struct wmi_cmd_hdr)); > > - if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0) > + if (wmi->cmd_rsp_buf && wmi->cmd_rsp_len) { > + if (skb->len < wmi->cmd_rsp_len) { > + wmi->cmd_rsp_status = -EMSGSIZE; my review agent notes that if this path is taken that there is no debug message alerting this. see my suggestion on dealing with this below... > + goto complete; > + } > memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len); > + } > + wmi->cmd_rsp_status = 0; > + > +complete: > > complete(&wmi->cmd_wait); > } > @@ -300,6 +308,7 @@ static int ath9k_wmi_cmd_issue(struct wmi *wmi, > /* record the rsp buffer and length */ > wmi->cmd_rsp_buf = rsp_buf; > wmi->cmd_rsp_len = rsp_len; > + wmi->cmd_rsp_status = 0; > > wmi->last_seq_id = wmi->tx_seq_id; > spin_unlock_irqrestore(&wmi->wmi_lock, flags); > @@ -356,9 +365,13 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id, > return -ETIMEDOUT; > } > > + spin_lock_irqsave(&wmi->wmi_lock, flags); > + ret = wmi->cmd_rsp_status; > + spin_unlock_irqrestore(&wmi->wmi_lock, flags); in order to have a debug message on length error we could drop the following "mutex_unlock() and return ret" so that all paths go past out: > + > mutex_unlock(&wmi->op_mutex); > > - return 0; > + return ret; > > out: and here log on error: if (ret) ath_dbg(...) > ath_dbg(common, WMI, "WMI failure for: %s\n", wmi_cmd_to_name(cmd_id)); suggest adding the errno to the log message since now there are multiple reasons it can fail > diff --git a/drivers/net/wireless/ath/ath9k/wmi.h b/drivers/net/wireless/ath/ath9k/wmi.h > index 5c3b710b8f31..0bb9d31f1a1c 100644 > --- a/drivers/net/wireless/ath/ath9k/wmi.h > +++ b/drivers/net/wireless/ath/ath9k/wmi.h > @@ -157,6 +157,7 @@ struct wmi { > u16 tx_seq_id; > u8 *cmd_rsp_buf; > u32 cmd_rsp_len; > + int cmd_rsp_status; > bool stopped; > > struct list_head pending_tx_events;