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[drivers][usb] Bound host interface setup and cleanup by manyangshen · Pull Request #11822 · RT-Thread/rt-thread · GitHub

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[drivers][usb] Bound host interface setup and cleanup - #11822

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[drivers][usb] Bound host interface setup and cleanup#11822
manyangshen wants to merge 2 commits into
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manyangshen:fix/usbhost-interface-bounds

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manyangshen commented Sep 22, 2026 •
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拉取/合并请求描述：(PR description)

The legacy USB host uses bNumInterfaces to index a fixed interface array. Reject counts above USB_MAX_INTERFACE after reading the full configuration descriptor. Detach must also stay within the array because it can run after a failed attach with an invalid descriptor.

Fixes #11288.

Validation

GCC 16.1 host tests compile the complete host core and class-driver manager with an emulated HCD. They pass valid counts of 0, 1 and 8; invalid counts of 9 and 255; differing header/full-descriptor counts; and partial setup followed by detach. The original code fails. Checks include class callbacks, allocation cleanup and adjacent device state.

Changed-line clang-format and git diff --check pass. No target BSP, QEMU or physical USB enumeration test was run. Other descriptor-length checks are outside this change.

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

  • 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
  • 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

  • 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
  • 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
  • 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
  • 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
  • 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
  • 代码是高质量的 Code in this PR is of high quality
  • 已经使用clang-format 源码格式化工具确保格式符合RT-Thread代码规范 This PR has been formatted with clang-format and complies with RT-Thread code specification
  • 如果是新增bsp, 已经添加ci检查到.github/ALL_BSP_COMPILE.json 详细请参考链接BSP自查

[usb][host] Bound interface enumeration and detach cleanup
0704e92 
Reject full configuration descriptors with more interfaces than the instance can hold. Clean up using the fixed interface-array capacity so an attach failure cannot leave detach trusting an oversized device-supplied count.

Fixes RT-Thread#11288
[drivers][usb] Clarify the configuration interface count check
e1a5447

github-actions Bot commented Sep 22, 2026

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👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

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  • Use workflow from 保持默认分支（通常为 master）
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  • 在 branch 输入框填写 PR 分支 fix/usbhost-interface-bounds
    Enter PR branch fix/usbhost-interface-bounds in the branch field
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完成后，提交将自动更新至 fix/usbhost-interface-bounds 分支，关联的 Pull Request 也会同步更新。
Once completed, commits will be pushed to the fix/usbhost-interface-bounds branch automatically, and the related Pull Request will be updated.

如有问题欢迎联系我们，再次感谢您的贡献！💐
If you have any questions, feel free to reach out. Thanks again for your contribution!

github-actions Bot commented Sep 22, 2026 •
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📌 Code Review Assignment

🏷️ Tag: components

Reviewers: @Maihuanyi

Changed Files (Click to expand)
  • components/legacy/usb/usbhost/core/usbhost_core.c

📊 Current Review Status (Last Updated: 2026-09-22 18:48 CST)

📝 Review Instructions

  1. 维护者可以通过单击此处来刷新审查状态: 🔄 刷新状态
    Maintainers can refresh the review status by clicking here: 🔄 Refresh Status

  2. 确认审核通过后评论 LGTM/lgtm
    Comment LGTM/lgtm after confirming approval

  3. PR合并前需至少一位维护者确认
    PR must be confirmed by at least one maintainer before merging

ℹ️ 刷新CI状态操作需要具备仓库写入权限。
ℹ️ Refresh CI status operation requires repository Write permission.

CLAassistant commented Sep 22, 2026 •
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All committers have signed the CLA.

manyangshen force-pushed the fix/usbhost-interface-bounds branch from 9392162 to e1a5447 Compare September 22, 2026 10:48

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[Bug] legacy USB host trusts device-controlled bNumInterfaces and can trigger out-of-bounds access in fixed interface array

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