tree 9812c7d3e5431852d25bc15860830413ff15dc51
parent e594e96e8a14101a6decabf6746bd5186287debc
author Eric Dumazet <eric.dumazet@gmail.com> 1247081765 +0000
committer David S. Miller <davem@davemloft.net> 1247369179 -0700

net: sk_prot_alloc() should not blindly overwrite memory

Some sockets use SLAB_DESTROY_BY_RCU, and our RCU code correctness
depends on sk->sk_nulls_node.next being always valid. A NULL
value is not allowed as it might fault a lockless reader.

Current sk_prot_alloc() implementation doesnt respect this hypothesis,
calling kmem_cache_alloc() with __GFP_ZERO. Just call memset() around
the forbidden field.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>