CVE-2022-48630

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.

Weakness

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected Software

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://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