Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 to < cd37bcb67f909a8683cc8c38a63ac7367a7f6161affected2d673b0e2f8d75b66aa21e5ca5d95c415dec5be7 to < 5da65537792b68b6052ffcab65e04c27aea6dfe4affected
Linux Linux
Default version status: affected
6.19affected0 to < 6.19unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected