title: crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ
description: 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.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: a8e32bbb96c2, lessThan: 71a89789552b, status: affected, versionType: git
version: 184f7bd08ce5, lessThan: 8be06f62b426, status: affected, versionType: git
version: 0f9b7b8df175, lessThan: 233a3cc60e7a, status: affected, versionType: git
version: ab9337c7cb6f, lessThan: 8a06f25f5941, status: affected, versionType: git
version: a680b1832ced, lessThan: 05d4d17475d8, status: affected, versionType: git
version: a680b1832ced, lessThan: 16287397ec5c, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.17, status: affected
version: 0, lessThan: 5.17, status: unaffected, versionType: custom
version: 4.19.245, lessThanOrEqual: 4.19.*, status: unaffected, versionType: custom
version: 5.4.196, lessThanOrEqual: 5.4.*, status: unaffected, versionType: custom
version: 5.10.118, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.15.42, lessThanOrEqual: 5.15.*, status: unaffected, versionType: custom
version: 5.17.10, lessThanOrEqual: 5.17.*, status: unaffected, versionType: custom
version: 5.18, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
