Re: [PATCH v2] mac80211: Add null pointer check for ieee80211_link_get_chanctx()

On Mon, 2025-05-26 at 17:19 +0800, Wentao Liang wrote:

The function ieee80211_chsw_switch_vifs() calls the function ieee80211_link_get_chanctx(), but does not check its return value. The return value is a null pointer if the ieee80211_link_get_chanctx() fails. This will lead to a null pointer dereference in the following code "&old_ctx->conf". A proper implementation can be found in ieee80211_link_use_reserved_assign().

Add a null pointer check and goto error handling path if the function fails.

How do you propose it can fail?

johannes