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mac80211_hwsim: Add missing check for HWSIM_ATTR_SIGNAL

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A wmediumd that does not send this attribute causes a NULL pointer
dereference, as the attribute is accessed even if it does not exist.

The attribute was required but never checked ever since userspace frame
forwarding has been introduced. The issue gets more problematic once we
allow wmediumd registration from user namespaces.

Cc: stable@vger.kernel.org
Fixes: 7882513bacb1 ("mac80211_hwsim driver support userspace frame tx/rx")
Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Martin Willi 2016-05-13 12:41:48 +02:00 committed by Johannes Berg
parent 0e6b525982
commit 62397da50b
1 changed files with 1 additions and 0 deletions
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drivers/net/wireless/mac80211_hwsim.c
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@ -2776,6 +2776,7 @@ static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2,
if (!info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER] ||
!info->attrs[HWSIM_ATTR_FLAGS] ||
!info->attrs[HWSIM_ATTR_COOKIE] ||
!info->attrs[HWSIM_ATTR_SIGNAL] ||
!info->attrs[HWSIM_ATTR_TX_INFO])
goto out;