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1eed677933
Now when __sctp_lookup_association is running in BH, it will try to
check if t->dead is set, but meanwhile other CPUs may be freeing this
transport and this assoc and if it happens that
__sctp_lookup_association checked t->dead a bit too early, it may think
that the association is still good while it was already freed.
So we fix this race by using atomic_add_unless in sctp_transport_hold.
After we get one transport from hashtable, we will hold it only when
this transport's refcnt is not 0, so that we can make sure t->asoc
cannot be freed before we hold the asoc again.
Note that sctp association is not freed using RCU so we can't use
atomic_add_unless() with it as it may just be too late for that either.
Fixes:
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||
|---|---|---|
| .. | ||
| auth.h | ||
| checksum.h | ||
| command.h | ||
| constants.h | ||
| sctp.h | ||
| sm.h | ||
| structs.h | ||
| tsnmap.h | ||
| ulpevent.h | ||
| ulpqueue.h | ||