mac80211: reject zero cookie in mgmt-tx/roc cancel

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When cancelling, you can cancel "any" (first in list) mgmt-tx
or remain-on-channel operation by using the value 0 for the
cookie along with the *opposite* operation, i.e.
 * cancel the first mgmt-tx by cancelling roc with 0 cookie
 * cancel the first roc by cancelling mgmt-tx with 0 cookie

This isn't really that bad since userspace should only pass
cookies that we gave it, but could lead to hard-to-debug
issues so better prevent it and reject zero values since we
never hand those out.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Johannes Berg 2015-12-01 23:15:26 +01:00

parent 959eb2fd70

commit 7d37fcd409

1 changed files with 3 additions and 0 deletions

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net/mac80211/offchannel.c

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