CVE-2021-47194: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type

First published: Wed Apr 10 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type If the userspace tools switch from NL80211_IFTYPE_P2P_GO to NL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), it does not call the cleanup cfg80211_stop_ap(), this leads to the initialization of in-use data. For example, this path re-init the sdata->assigned_chanctx_list while it is still an element of assigned_vifs list, and makes that linked list corrupt.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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