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authorJohannes Berg <johannes.berg@intel.com>2016-11-15 12:05:11 +0100
committerJohannes Berg <johannes.berg@intel.com>2016-11-18 08:44:44 +0100
commit9853a55ef1bb66d7411136046060bbfb69c714fa (patch)
treea8efd65d0ba6529fc0e656ae88efa9507ecccb0e /net/wireless/core.h
parent4fb7f8af1f4c14a2a6cee7c9ff0cf999d918c72d (diff)
cfg80211: limit scan results cache size
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. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/core.h')
-rw-r--r--net/wireless/core.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 08d2e948c9ad..f0c0c8a48c92 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -71,6 +71,7 @@ struct cfg80211_registered_device {
struct list_head bss_list;
struct rb_root bss_tree;
u32 bss_generation;
+ u32 bss_entries;
struct cfg80211_scan_request *scan_req; /* protected by RTNL */
struct sk_buff *scan_msg;
struct cfg80211_sched_scan_request __rcu *sched_scan_req;