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[2001:14ba:a073:af00:264b:feff:fe8b:be8a]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b2db9d2688sm620538e87.57.2026.07.30.17.32.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jul 2026 17:32:10 -0700 (PDT) From: Dmitry Baryshkov Date: Fri, 31 Jul 2026 03:31:43 +0300 Subject: [PATCH v2 4/5] media: iris: reject open() when the session limit is reached Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260731-iris-fixes-v2-4-94c002016a09@oss.qualcomm.com> References: <20260731-iris-fixes-v2-0-94c002016a09@oss.qualcomm.com> In-Reply-To: <20260731-iris-fixes-v2-0-94c002016a09@oss.qualcomm.com> To: Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab , Hans Verkuil , Stefan Schmidt , Vedang Nagar Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2304; i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id; bh=UTnwS/2KKMHvEnj1G5hWv78QxtNSfDbjsv+TIRCZ8q0=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBqa+z8pcYXFxCxQYZ5HVdyRAo+4mAppT+Dx+uFq z+/3vsTq3GJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCamvs/AAKCRCLPIo+Aiko 1RbUB/96EDm0/+sFBiakv8N/d/MwqjNAj3xbQZgcnod2Mz46RHG23UrI9zlAotJhcq7K9JxEoNQ W8xVZLXCcuMFnXEzyeKDHZXpNF2VSlfP/jQlhv7v1MTuNedpnI5jr+qniO2/prGams3F/LJep0g 7NvCfxRK6qFXdOXDWqx5PCa3Pi5/HIBCU5IlFMIOUwRdgCsCNCTogvH5qjWkmEUPsZonZxPXJEm zlMAbItBMOZTtJW0AepRvuxRXcWtRpfhunZvZiKRMfkfQYMUIV+38KT1Hz9GORoyWREWdUyiuqA fRTserw2he5KlEhODQhvZdZKJH9nVPiGJ1qQ0OWJUlOby35F X-Developer-Key: i=dmitry.baryshkov@oss.qualcomm.com; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-Proofpoint-GUID: BNnCB1tT2dkkskt_8oxe2Nc6JRnbDyZZ X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMxMDAwMiBTYWx0ZWRfX9ypRAHs4LoWE 6NBAheWkukX7X/rw3lMlLbBUXEjGTtRtTuRGc8jhrFy7S0esmrLy9CGTB6hYQ3BwQFD1ai2dMpa Q7E90TniSHpYmu9vWy7qmrhrOLG2B9g= X-Proofpoint-ORIG-GUID: BNnCB1tT2dkkskt_8oxe2Nc6JRnbDyZZ X-Authority-Analysis: v=2.4 cv=DconbPtW c=1 sm=1 tr=0 ts=6a6bed0d cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=EUspDBNiAAAA:8 a=8bbKkYRu5Ug-Ka50F9MA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMxMDAwMiBTYWx0ZWRfX5UAmR/zGAAsi tlKEnsr4ePhwc8gS3Xa8AxQfdAncyZocFbR985tZevoQ4CAqojRJq3KM7a7aaDWh6qOdWYATwmb X54M0YA22sUAZ0BdZSA94D2tiXYaadp8fjjb39NAlqq7RtQo9K92OkdNm3Eu6kv9SPFwyQf1WOe 4XAMe6vtK9BzqwKQalAEut8newRCVx9j0/FTBlP/2Tqv6L5CZASp+1IOlXEwakFezHWtBtuy2bW 9UmghAeiblkbUjtmNNby+Kdi4UohrHpb/nmo8jjO/HMgcD1elAedh+yeNHymcG/fCZwnYpLJJHS wW1ZNwCpdm221Bv9a9tQb+6myjMwwnTQB1fJS1zqkS5QimdbMqQr82W7541agaGmTITLpWcMVUE UnMQyBAiH0lmeNVRm4d2L5ypeDbczxLZzeXjV+WbiI3ERF5a+zHdpM2ykVYBJVN//9x8gXHHYw/ 75COz4y5a92GHTc9vCQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-30_07,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 phishscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607310002 iris_add_session() silently skips adding the instance to core->instances once max_session_count is reached, but returns void, so iris_open() continues as if it succeeded and hands a file descriptor back to userspace. As the instance is not on core->instances, firmware responses for it are dropped and every subsequent ioctl times out. Make iris_add_session() return an error when the limit is reached and fail iris_open() accordingly, freeing the partially initialised instance. Fixes: 38fc8beaba55 ("media: iris: implement reqbuf ioctl with vb2_queue_setup") Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Dmitry Baryshkov --- drivers/media/platform/qcom/iris/iris_vidc.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/media/platform/qcom/iris/iris_vidc.c b/drivers/media/platform/qcom/iris/iris_vidc.c index fcbc60016bee..4ca9185b3d2b 100644 --- a/drivers/media/platform/qcom/iris/iris_vidc.c +++ b/drivers/media/platform/qcom/iris/iris_vidc.c @@ -40,21 +40,23 @@ static void iris_v4l2_fh_deinit(struct iris_inst *inst, struct file *filp) v4l2_fh_exit(&inst->fh); } -static void iris_add_session(struct iris_inst *inst) +static int iris_add_session(struct iris_inst *inst) { struct iris_core *core = inst->core; struct iris_inst *iter; u32 count = 0; - mutex_lock(&core->lock); + guard(mutex)(&core->lock); list_for_each_entry(iter, &core->instances, list) count++; - if (count < core->iris_platform_data->max_session_count) - list_add_tail(&inst->list, &core->instances); + if (count >= core->iris_platform_data->max_session_count) + return -EBUSY; - mutex_unlock(&core->lock); + list_add_tail(&inst->list, &core->instances); + + return 0; } static void iris_remove_session(struct iris_inst *inst) @@ -206,12 +208,17 @@ int iris_open(struct file *filp) if (ret) goto fail_m2m_ctx_release; - iris_add_session(inst); + ret = iris_add_session(inst); + if (ret) + goto fail_inst_deinit; inst->fh.m2m_ctx = inst->m2m_ctx; return 0; +fail_inst_deinit: + kfree(inst->fmt_src); + kfree(inst->fmt_dst); fail_m2m_ctx_release: v4l2_m2m_ctx_release(inst->m2m_ctx); fail_m2m_release: -- 2.47.3