Description
In the Linux kernel, the following vulnerability has been resolved: mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations ieee80211_chan_bw_change() iterates all stations and accesses link->reserved.oper via sta->sdata->link[link_id]. For stations on AP_VLAN interfaces (e.g. 4addr WDS clients), sta->sdata points to the VLAN sdata, whose link never participates in chanctx reservations. This leaves link->reserved.oper zero-initialized with chan == NULL, causing a NULL pointer dereference in __ieee80211_sta_cap_rx_bw() when accessing chandef->chan->band during CSA. Resolve the VLAN sdata to its parent AP sdata using get_bss_sdata() before accessing link data. [also change sta->sdata in ARRAY_SIZE even if it doesn't matter]
Product status
b27512368591fc959768df1f7dacf2a96b1bd036 (git) before 65c25b588994dd422fea73fa322de56e1ae4a33b
b27512368591fc959768df1f7dacf2a96b1bd036 (git) before 5a86d4e920d9783a198e39cf53f0e410fba5fbd6
b27512368591fc959768df1f7dacf2a96b1bd036 (git) before 3c6629e859a2211a1fbb4868f915413f80001ca5
b27512368591fc959768df1f7dacf2a96b1bd036 (git) before 672e5229e1ecfc2a3509b53adcb914d8b024a853
6.11
Any version before 6.11
6.12.78 (semver)
6.18.20 (semver)
6.19.10 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/65c25b588994dd422fea73fa322de56e1ae4a33b
git.kernel.org/...c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6
git.kernel.org/...c/3c6629e859a2211a1fbb4868f915413f80001ca5
git.kernel.org/...c/672e5229e1ecfc2a3509b53adcb914d8b024a853