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authorJohannes Berg <johannes.berg@intel.com>2015-11-27 21:59:41 +0100
committerJohannes Berg <johannes.berg@intel.com>2015-12-02 22:27:53 +0100
commitc1df932c0574c13ab3ce72e969c9647ff3aaad68 (patch)
tree837ad522ed41b46dddc5eb88bf7ed26b3bb6b477 /net/mac80211/cfg.c
parent4e39ccac0d678eacb5dd6ffc5057531af33c12d6 (diff)
downloadlinux-c1df932c0574c13ab3ce72e969c9647ff3aaad68.tar.bz2
mac80211: fix off-channel mgmt-tx uninitialized variable usage
In the last change here, I neglected to update the cookie in one code path: when a mgmt-tx has no real cookie sent to userspace as it doesn't wait for a response, but is off-channel. The original code used the SKB pointer as the cookie and always assigned the cookie to the TX SKB in ieee80211_start_roc_work(), but my change turned this around and made the code rely on a valid cookie being passed in. Unfortunately, the off-channel no-wait TX path wasn't assigning one at all, resulting in an uninitialized stack value being used. This wasn't handed back to userspace as a cookie (since in the no-wait case there isn't a cookie), but it was tested for non-zero to distinguish between mgmt-tx and off-channel. Fix this by assigning a dummy non-zero cookie unconditionally, and get rid of a misleading comment and some dead code while at it. I'll clean up the ACK SKB handling separately later. Fixes: 3b79af973cf4 ("mac80211: stop using pointers as userspace cookies") Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/cfg.c')
-rw-r--r--net/mac80211/cfg.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index c2bd1b6a6922..da471eef07bb 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3454,8 +3454,12 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
goto out_unlock;
}
} else {
- /* for cookie below */
- ack_skb = skb;
+ /* Assign a dummy non-zero cookie, it's not sent to
+ * userspace in this case but we rely on its value
+ * internally in the need_offchan case to distinguish
+ * mgmt-tx from remain-on-channel.
+ */
+ *cookie = 0xffffffff;
}
if (!need_offchan) {