cve-2024-36895
Vulnerability from cvelistv5
Published
2024-05-30 15:29
Modified
2024-12-19 09:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: use correct buffer size when parsing configfs lists This commit fixes uvc gadget support on 32-bit platforms. Commit 0df28607c5cb ("usb: gadget: uvc: Generalise helper functions for reuse") introduced a helper function __uvcg_iter_item_entries() to aid with parsing lists of items on configfs attributes stores. This function is a generalization of another very similar function, which used a stack-allocated temporary buffer of fixed size for each item in the list and used the sizeof() operator to check for potential buffer overruns. The new function was changed to allocate the now variably sized temp buffer on heap, but wasn't properly updated to also check for max buffer size using the computed size instead of sizeof() operator. As a result, the maximum item size was 7 (plus null terminator) on 64-bit platforms, and 3 on 32-bit ones. While 7 is accidentally just barely enough, 3 is definitely too small for some of UVC configfs attributes. For example, dwFrameInteval, specified in 100ns units, usually has 6-digit item values, e.g. 166666 for 60fps.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/650ae71c80749fc7cb8858c8049f532eaec64410
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a54e5052bde582fd0e7677334fe7a5be92e242c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a422089ce42ced73713e5032aad29a9a7cbe9528
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/650ae71c80749fc7cb8858c8049f532eaec64410
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7a54e5052bde582fd0e7677334fe7a5be92e242c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a422089ce42ced73713e5032aad29a9a7cbe9528
Impacted products
Vendor Product Version
Linux Linux Version: 0df28607c5cb4fe60bba591e9858a8f7ba39aa4a
Version: 0df28607c5cb4fe60bba591e9858a8f7ba39aa4a
Version: 0df28607c5cb4fe60bba591e9858a8f7ba39aa4a
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   Linux Linux Version: 6.3
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