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DFS: Do not process radar event while disabling an interface

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In the normal case hostapd_disable_iface() and hostapd_enable_iface()
will be done while switching to another DFS channel upon radar
detection. In certain scenarios radar detected event can come while
hostapd_disable_iface() is in progress and iface->current_mode will be
NULL in that scenario. Previously, we did not check for this scenario
and proceeded with the radar detection logic which can trigger a
segmentation fault. To fix this, avoid proceeding the radar detection
event if iface->current_mode is NULL.

Signed-off-by: Seevalamuthu Mariappan <seevalam@codeaurora.org>
This commit is contained in:
Seevalamuthu Mariappan 2019-12-13 15:46:41 +05:30 committed by Jouni Malinen
parent 744a2f9846
commit 7242087d1c
1 changed files with 4 additions and 2 deletions
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6
src/ap/dfs.c
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@ -1040,8 +1040,10 @@ int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq,
return 0; return 0;
/* mark radar frequency as invalid */ /* mark radar frequency as invalid */
set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, res = set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE); cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE);
if (!res)
return 0;
/* Skip if reported radar event not overlapped our channels */ /* Skip if reported radar event not overlapped our channels */
res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2); res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2);