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net: dccp: initialize (addr,port) listening hashtable

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Commit d9fbc7f643 "net: tcp: prefer listeners bound to an address"
removes port-only listener lookups. This caused segfaults in DCCP
lookups because DCCP did not initialize the (addr,port) hashtable.

This patch adds said initialization.

The only non-trivial issue here is the size of the new hashtable.
It seemed reasonable to make it match the size of the port-only
hashtable (= INET_LHTABLE_SIZE) that was used previously. Other
parameters to inet_hashinfo2_init() match those used in TCP.

V2 changes: marked inet_hashinfo2_init as an exported symbol
so that DCCP compiles when configured as a module.

Tested: syzcaller issues fixed; the second patch in the patchset
        tests that DCCP lookups work correctly.

Fixes: d9fbc7f643 "net: tcp: prefer listeners bound to an address"
Reported-by: syzcaller <[email protected]>
Signed-off-by: Peter Oskolkov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Peter Oskolkov 2018-12-16 15:42:48 -08:00 • committed by David S. Miller
commit eedbbb0d98
2 changed files with 4 additions and 0 deletions
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1
net/ipv4/inet_hashtables.c
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@ -785,6 +785,7 @@ void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
h->lhash2[i].count = 0;
}
}
EXPORT_SYMBOL_GPL(inet_hashinfo2_init);
int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
{