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Eric Dumazet 941297f443 netfilter: nf_conntrack: nf_conntrack_alloc() fixes ... When a slab cache uses SLAB_DESTROY_BY_RCU, we must be careful when allocating objects, since slab allocator could give a freed object still used by lockless readers. In particular, nf_conntrack RCU lookups rely on ct->tuplehash[xxx].hnnode.next being always valid (ie containing a valid 'nulls' value, or a valid pointer to next object in hash chain.) kmem_cache_zalloc() setups object with NULL values, but a NULL value is not valid for ct->tuplehash[xxx].hnnode.next. Fix is to call kmem_cache_alloc() and do the zeroing ourself. As spotted by Patrick, we also need to make sure lookup keys are committed to memory before setting refcount to 1, or a lockless reader could get a reference on the old version of the object. Its key re-check could then pass the barrier. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>		16 years ago
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00-INDEX	…
NMI-RCU.txt	…
RTFP.txt	…
UP.txt	…
arrayRCU.txt	…
checklist.txt	…
listRCU.txt	Doc: Fix wrong API example usage of call_rcu().	16 years ago
rcu.txt	Doc: Fix missing whitespaces in RCU documentation.	16 years ago
rcubarrier.txt	…
rculist_nulls.txt	netfilter: nf_conntrack: nf_conntrack_alloc() fixes	16 years ago
rcuref.txt	doc/RCU: fix pseudocode in rcuref.txt	17 years ago
torture.txt	…
trace.txt	…
whatisRCU.txt	…