RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
In the Linux kernel, the following vulnerability has been resolved: RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask() The function divides number of online CPUs by num_core_siblings, and later checks the divider by zero. This implies a possibility to get and divide-by-zero runtime error. Fix it by moving the check prior to division. This also helps to save one indentation level.
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask() The function divides number of online CPUs by num_core_siblings, and later checks the divider by zero. This implies a possibility to get and divide-by-zero runtime error. Fix it by moving the check prior to division. This also helps to save one indentation level.
05 / REFERENCES
Further evidence
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/1a7cf828ed861de5be1aff99e10f114b363c19d3
- https://git.kernel.org/stable/c/31d0599a23efdbfe579bfbd1eb8f8c942f13744d
- https://git.kernel.org/stable/c/4b4317b0d758ff92ba96f4e448a8992a6fe607bf
- https://git.kernel.org/stable/c/59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a
- https://git.kernel.org/stable/c/89fdac333a17ed990b41565630ef4791782e02f5
- https://git.kernel.org/stable/c/9b05e91afe948ed819bf87d7ba0fccf451ed79a6
- https://git.kernel.org/stable/c/9bba1a9994c523b44db64f63b564b4719ea2b7ef
- https://git.kernel.org/stable/c/9d3211cb61a0773a2440d0a0698c1e6e7429f907
- https://git.kernel.org/stable/c/ac53f377393cc85156afdc90b636e84e544a6f96
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39742.json
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://nvd.nist.gov/vuln/detail/CVE-2025-39742