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Mon, 21 Oct 2024 09:25:33 +0000 Received: from NALASPPMTA04.qualcomm.com (NALASPPMTA04.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 49L9Ld4Z019774; Mon, 21 Oct 2024 09:25:32 GMT Received: from hu-devc-lv-u18-c.qualcomm.com (hu-vtanuku-lv.qualcomm.com [10.47.206.121]) by NALASPPMTA04.qualcomm.com (PPS) with ESMTP id 49L9PWxF025908; Mon, 21 Oct 2024 09:25:32 +0000 Received: by hu-devc-lv-u18-c.qualcomm.com (Postfix, from userid 410733) id 5417B5005B0; Mon, 21 Oct 2024 02:25:32 -0700 (PDT) From: Visweswara Tanuku To: linux-kernel@vger.kernel.org Cc: srinivas.kandagatla@linaro.org, linux-sound@vger.kernel.org, Visweswara Tanuku Subject: [PATCH] slimbus: messaging: Free transaction ID in delayed interrupt scenario Date: Mon, 21 Oct 2024 02:25:05 -0700 Message-Id: <20241021092505.31240-1-quic_vtanuku@quicinc.com> X-Mailer: git-send-email 2.17.1 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: cGK4F46DWsca6usXkkhkUf05UiQdA22i X-Proofpoint-GUID: cGK4F46DWsca6usXkkhkUf05UiQdA22i X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 phishscore=0 spamscore=0 clxscore=1011 priorityscore=1501 impostorscore=0 mlxscore=0 suspectscore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=799 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410210067 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: In case of interrupt delay for any reason, slim_do_transfer() returns timeout error but the transaction ID (TID) is not freed. This results into invalid memory access inside qcom_slim_ngd_rx_msgq_cb() due to invalid TID. Fix the issue by freeing the TID in slim_do_transfer() before returning timeout error to avoid invalid memory access. Call trace: __memcpy_fromio+0x20/0x190 qcom_slim_ngd_rx_msgq_cb+0x130/0x290 [slim_qcom_ngd_ctrl] vchan_complete+0x2a0/0x4a0 tasklet_action_common+0x274/0x700 tasklet_action+0x28/0x3c _stext+0x188/0x620 run_ksoftirqd+0x34/0x74 smpboot_thread_fn+0x1d8/0x464 kthread+0x178/0x238 ret_from_fork+0x10/0x20 Code: aa0003e8 91000429 f100044a 3940002b (3800150b) ---[ end trace 0fe00bec2b975c99 ]--- Kernel panic - not syncing: Oops: Fatal exception in interrupt. Signed-off-by: Visweswara Tanuku --- drivers/slimbus/messaging.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c index 242570a5e565..455c1fd1490f 100644 --- a/drivers/slimbus/messaging.c +++ b/drivers/slimbus/messaging.c @@ -148,8 +148,9 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn) } ret = ctrl->xfer_msg(ctrl, txn); - - if (!ret && need_tid && !txn->msg->comp) { + if (ret == -ETIMEDOUT) { + slim_free_txn_tid(ctrl, txn); + } else if (!ret && need_tid && !txn->msg->comp) { unsigned long ms = txn->rl + HZ; time_left = wait_for_completion_timeout(txn->comp,