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net: dccp: fix kernel crash on module load

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Patch eedbbb0d98 "net: dccp: initialize (addr,port) ..."
added calling to inet_hashinfo2_init() from dccp_init().

However, inet_hashinfo2_init() is marked as __init(), and
thus the kernel panics when dccp is loaded as module. Removing
__init() tag from inet_hashinfo2_init() is not feasible because
it calls into __init functions in mm.

This patch adds inet_hashinfo2_init_mod() function that can
be called after the init phase is done; changes dccp_init() to
call the new function; un-marks inet_hashinfo2_init() as
exported.

Fixes: eedbbb0d98 ("net: dccp: initialize (addr,port) ...")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Peter Oskolkov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Peter Oskolkov 2018-12-24 12:57:17 -08:00 • committed by David S. Miller
commit c92c81df93
3 changed files with 31 additions and 12 deletions
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8
net/dccp/proto.c
View file

@ -1139,11 +1139,11 @@ static int __init dccp_init(void)
rc = percpu_counter_init(&dccp_orphan_count, 0, GFP_KERNEL);
if (rc)
goto out_fail;
rc = -ENOBUFS;
inet_hashinfo_init(&dccp_hashinfo);
inet_hashinfo2_init(&dccp_hashinfo, "dccp_listen_portaddr_hash",
INET_LHTABLE_SIZE, 21, /* one slot per 2 MB*/
0, 64 * 1024);
rc = inet_hashinfo2_init_mod(&dccp_hashinfo);
if (rc)
goto out_fail;
rc = -ENOBUFS;
dccp_hashinfo.bind_bucket_cachep =
kmem_cache_create("dccp_bind_bucket",
sizeof(struct inet_bind_bucket), 0,