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    Subject[PATCH 5.11 058/601] cfg80211: scan: drop entry from hidden_list on overflow
    Date
    From: Johannes Berg <johannes.berg@intel.com>

    commit 010bfbe768f7ecc876ffba92db30432de4997e2a upstream.

    If we overflow the maximum number of BSS entries and free the
    new entry, drop it from any hidden_list that it may have been
    added to in the code above or in cfg80211_combine_bsses().

    Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
    Link: https://lore.kernel.org/r/20210416094212.5de7d1676ad7.Ied283b0bc5f504845e7d6ab90626bdfa68bb3dc0@changeid
    Cc: stable@vger.kernel.org
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/wireless/scan.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/net/wireless/scan.c
    +++ b/net/wireless/scan.c
    @@ -1751,6 +1751,8 @@ cfg80211_bss_update(struct cfg80211_regi

    if (rdev->bss_entries >= bss_entries_limit &&
    !cfg80211_bss_expire_oldest(rdev)) {
    + if (!list_empty(&new->hidden_list))
    + list_del(&new->hidden_list);
    kfree(new);
    goto drop;
    }

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