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nl80211: Zero num_modes if nl80211_get_hw_feature_data() fails

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It was possible that nl80211_get_hw_feature_data() function would return
NULL when num_modes is not set to zero. This might result in a later crash
when accessing hw.modes. This may be reproduced with hwsim oom tests, for
example, dbus_connect_oom.
Fix that by zeroing num_modes if NULL is returned.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This commit is contained in:
Andrei Otcheretianski 2016-12-28 15:47:07 +02:00 committed by Jouni Malinen
parent 5e8f231947
commit 517b5f928f
1 changed files with 1 additions and 0 deletions
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src/drivers/driver_nl80211_capa.c
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@ -1783,6 +1783,7 @@ nl80211_get_hw_feature_data(void *priv, u16 *num_modes, u16 *flags)
os_free(result.modes[i].rates); os_free(result.modes[i].rates);
} }
os_free(result.modes); os_free(result.modes);
*num_modes = 0;
return NULL; return NULL;
} }
return wpa_driver_nl80211_postprocess_modes(result.modes, return wpa_driver_nl80211_postprocess_modes(result.modes,