CVE-2024-26747

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CVE-2024-26747

Summary: usb: roles: fix NULL pointer issue when put module's reference

Details: In the Linux kernel, the following vulnerability has been resolved: usb: roles: fix NULL pointer issue when put module's reference In current design, usb role class driver will get usb_role_switch parent's module reference after the user get usb_role_switch device and put the reference after the user put the usb_role_switch device. However, the parent device of usb_role_switch may be removed before the user put the usb_role_switch. If so, then, NULL pointer issue will be met when the user put the parent module's reference. This will save the module pointer in structure of usb_role_switch. Then, we don't need to find module by iterating long relations.

References: https://git.kernel.org/stable/c/0158216805ca7e498d07de38840d2732166ae5fa, https://git.kernel.org/stable/c/01f82de440f2ab07c259b7573371e1c42e5565db, https://git.kernel.org/stable/c/1c9be13846c0b2abc2480602f8ef421360e1ad9e, https://git.kernel.org/stable/c/4b45829440b1b208948b39cc71f77a37a2536734, https://git.kernel.org/stable/c/e279bf8e51893e1fe160b3d8126ef2dd00f661e1, https://git.kernel.org/stable/c/ef982fc41055fcebb361a92288d3225783d12913, https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html, https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26747.json, https://nvd.nist.gov/vuln/detail/CVE-2024-26747, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git