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GET /api/patches/2232369/?format=api
{ "id": 2232369, "url": "http://patchwork.ozlabs.org/api/patches/2232369/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260504-qom-tests-v2-45-ef7e3dc94f7a@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260504-qom-tests-v2-45-ef7e3dc94f7a@redhat.com>", "list_archive_url": null, "date": "2026-05-04T11:35:33", "name": "[v2,45/46] hw/i2c/pmbus: fix undefined behavior in pmbus_direct_mode2data", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d4dfbeb2766de26513f5d52b74568873b4eb8bf4", "submitter": { "id": 66774, "url": "http://patchwork.ozlabs.org/api/people/66774/?format=api", "name": "Marc-André Lureau", "email": "marcandre.lureau@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260504-qom-tests-v2-45-ef7e3dc94f7a@redhat.com/mbox/", "series": [ { "id": 502649, "url": "http://patchwork.ozlabs.org/api/series/502649/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502649", "date": "2026-05-04T11:34:48", "name": "Fix various QOM object life-cycle issues", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/502649/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2232369/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2232369/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=QXK/VMs3;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=openpgp;\n fpr=87A9BD933F87C606D276F62DDAE8E10975969CE5", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111", "Received-SPF": "pass client-ip=170.10.133.124;\n envelope-from=marcandre.lureau@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com", "X-Spam_score_int": "8", "X-Spam_score": "0.8", "X-Spam_bar": "/", "X-Spam_report": "(0.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.444,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=no autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "The intermediate result of (Y * 10^-R - b) / m can be negative when\nthe bias (b) is large and the raw register value is small (e.g. zero\non an uninitialized device). Assigning that negative double to uint32_t\nis undefined behavior, caught by UBSan/clang.\n\nUse a double intermediate and clamp negative results to zero.\n\nFixes: 3746d5c15e70 (\"hw/i2c: add support for PMBus\")\nSigned-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>\n---\n hw/i2c/pmbus_device.c | 4 ++--\n 1 file changed, 2 insertions(+), 2 deletions(-)", "diff": "diff --git a/hw/i2c/pmbus_device.c b/hw/i2c/pmbus_device.c\nindex 853dc4b4342..861f5b4fb63 100644\n--- a/hw/i2c/pmbus_device.c\n+++ b/hw/i2c/pmbus_device.c\n@@ -23,8 +23,8 @@ uint16_t pmbus_data2direct_mode(PMBusCoefficients c, uint32_t value)\n uint32_t pmbus_direct_mode2data(PMBusCoefficients c, uint16_t value)\n {\n /* X = (Y * 10^-R - b) / m */\n- uint32_t x = (value / pow(10, c.R) - c.b) / c.m;\n- return x;\n+ double x = (value / pow(10, c.R) - c.b) / c.m;\n+ return (x > 0) ? (uint32_t)x : 0;\n }\n \n uint16_t pmbus_data2linear_mode(uint16_t value, int exp)\n", "prefixes": [ "v2", "45/46" ] }