Bug 2347699 (CVE-2022-49582)

Summary: CVE-2022-49582 kernel: net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:03:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering

The "ds" iterator variable used in dsa_port_reset_vlan_filtering() ->
dsa_switch_for_each_port() overwrites the "dp" received as argument,
which is later used to call dsa_port_vlan_filtering() proper.

As a result, switches which do enter that code path (the ones with
vlan_filtering_is_global=true) will dereference an invalid dp in
dsa_port_reset_vlan_filtering() after leaving a VLAN-aware bridge.

Use a dedicated "other_dp" iterator variable to avoid this from
happening.
Comment 1 Avinash Hanwate 2025-02-26 19:01:38 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022608-CVE-2022-49582-8f09@gregkh/T