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GET /api/patches/2215482/?format=api
{ "id": 2215482, "url": "http://patchwork.ozlabs.org/api/patches/2215482/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260324170606.5407-1-sebasjosue84@gmail.com/", "project": { "id": 35, "url": "http://patchwork.ozlabs.org/api/projects/35/?format=api", "name": "Linux I2C development", "link_name": "linux-i2c", "list_id": "linux-i2c.vger.kernel.org", "list_email": "linux-i2c@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260324170606.5407-1-sebasjosue84@gmail.com>", "list_archive_url": null, "date": "2026-03-24T17:06:06", "name": "[v2] HID: mcp2221: validate report size in raw_event handler", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "08a9d5aaede12191ec650d2d0ef47efcf29e14b1", "submitter": { "id": 92955, "url": "http://patchwork.ozlabs.org/api/people/92955/?format=api", "name": "Sebastian Alba Vives", "email": "sebasjosue84@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260324170606.5407-1-sebasjosue84@gmail.com/mbox/", "series": [ { "id": 497319, "url": "http://patchwork.ozlabs.org/api/series/497319/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=497319", "date": "2026-03-24T17:06:06", "name": "[v2] HID: mcp2221: validate report size in raw_event handler", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/497319/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2215482/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215482/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-i2c+bounces-16705-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-i2c@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=XPHrwHAH;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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Since __hid_input_report()\ninvokes the driver's raw_event callback before\nhid_report_raw_event() performs its own report-size validation, a\ndevice sending a truncated HID report can cause out-of-bounds heap\nreads in the kernel.\n\nThe most critical access is the memcpy from data[50] into\nmcp->adc_values (6 bytes) when CONFIG_IIO is reachable. Other\nunchecked accesses include data[20] and a memcpy at data[22].\nAdditionally, a memcpy with device-controlled length (data[3],\nup to 60 bytes) from data[4] does not verify that size is large\nenough to cover the copy.\n\nMCP2221 devices use 64-byte HID reports. Add a check at the top of\nthe handler to reject any report shorter than expected, and log a\nwarning to aid debugging.\n\nCc: stable@vger.kernel.org\nSigned-off-by: Sebastian Josue Alba Vives <sebasjosue84@gmail.com>\n---\n drivers/hid/hid-mcp2221.c | 5 +++++\n 1 file changed, 5 insertions(+)", "diff": "diff --git a/drivers/hid/hid-mcp2221.c b/drivers/hid/hid-mcp2221.c\nindex ef3b5c77c..770c305d8 100644\n--- a/drivers/hid/hid-mcp2221.c\n+++ b/drivers/hid/hid-mcp2221.c\n@@ -850,6 +850,11 @@ static int mcp2221_raw_event(struct hid_device *hdev,\n {\n \tu8 *buf;\n \tstruct mcp2221 *mcp = hid_get_drvdata(hdev);\n+\t/* MCP2221 always sends 64-byte reports */\n+\tif (size < 64) {\n+\t\thid_warn(hdev, \"report too short: %d < 64\\n\", size);\n+\t\treturn 0;\n+\t}\n \n \tswitch (data[0]) {\n \n", "prefixes": [ "v2" ] }