CVE-2022-48630

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CVE-2022-48630

Summary: crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ

Details: In the Linux kernel, the following vulnerability has been resolved: crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ The commit referenced in the Fixes tag removed the 'break' from the else branch in qcom_rng_read(), causing an infinite loop whenever 'max' is not a multiple of WORD_SZ. This can be reproduced e.g. by running: kcapi-rng -b 67 >/dev/null There are many ways to fix this without adding back the 'break', but they all seem more awkward than simply adding it back, so do just that. Tested on a machine with Qualcomm Amberwing processor.

References: https://git.kernel.org/stable/c/05d4d17475d8d094c519bb51658bc47899c175e3, https://git.kernel.org/stable/c/16287397ec5c08aa58db6acf7dbc55470d78087d, https://git.kernel.org/stable/c/233a3cc60e7a8fe0be8cf9934ae7b67ba25a866c, https://git.kernel.org/stable/c/71a89789552b7faf3ef27969b9bc783fa0df3550, https://git.kernel.org/stable/c/8a06f25f5941c145773204f2f7abef95b4ffb8ce, https://git.kernel.org/stable/c/8be06f62b426801dba43ddf8893952a0e62ab6ae, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48630.json, https://nvd.nist.gov/vuln/detail/CVE-2022-48630, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git