Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: enetc: fix potential divide-by-zero when num_vsi is zero For i.MX94 series, all the standalone ENETCs do not support SR-IOV, so pf->caps.num_vsi is zero. This leads to a divide-by-zero in enetc4_default_rings_allocation() when distributing rings among PF and VFs. Division by zero is undefined behavior in C. On ARM64, the UDIV/SDIV instructions silently return zero rather than raising an exception, so the issue does not cause a visible crash. However, relying on this behavior is incorrect and poses a cross-platform compatibility risk. Add an explicit check for num_vsi == 0 and return early after the PF's rings have been configured.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 before cd37bcb67f909a8683cc8c38a63ac7367a7f6161; affected 2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 before 5da65537792b68b6052ffcab65e04c27aea6dfe4 |
| Linux / Linux | affected 6.19; unaffected 0 before 6.19; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.