• Johannes Berg's avatar
    cfg80211: limit scan results cache size · 98db9446
    Johannes Berg authored
    commit 9853a55e upstream.
    
    It's possible to make scanning consume almost arbitrary amounts
    of memory, e.g. by sending beacon frames with random BSSIDs at
    high rates while somebody is scanning.
    
    Limit the number of BSS table entries we're willing to cache to
    1000, limiting maximum memory usage to maybe 4-5MB, but lower
    in practice - that would be the case for having both full-sized
    beacon and probe response frames for each entry; this seems not
    possible in practice, so a limit of 1000 entries will likely be
    closer to 0.5 MB.
    Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
    Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
    98db9446
scan.c 39.9 KB