diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2008-01-28 20:52:12 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-31 19:27:08 -0800 |
| commit | 8cf8e5a67fb07f583aac94482ba51a7930dab493 (patch) | |
| tree | 0fa0b3c39ff3c1f3aca7b1013a1932f18ca2021d /net/ipv4 | |
| parent | 406a1d868001423c85a3165288e566e65f424fe6 (diff) | |
[INET_DIAG]: Fix inet_diag_lock_handler error path.
Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=9825
The inet_diag_lock_handler function uses ERR_PTR to encode errors but
its callers were testing against NULL.
This only happens when the only inet_diag modular user, DCCP, is not
built into the kernel or available as a module.
Also there was a problem with not dropping the mutex lock when a handler
was not found, also fixed in this patch.
This caused an OOPS and ss would then hang on subsequent calls, as
&inet_diag_table_mutex was being left locked.
Thanks to spike at ml.yaroslavl.ru for report it after trying 'ss -d'
on a kernel that doesn't have DCCP available.
This bug was introduced in cset
d523a328fb0271e1a763e985a21f2488fd816e7e ("Fix inet_diag dead-lock
regression"), after 2.6.24-rc3, so just 2.6.24 seems to be affected.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/inet_diag.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 605ed2cd797..4cfb15c461f 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -259,8 +259,10 @@ static int inet_diag_get_exact(struct sk_buff *in_skb, const struct inet_diag_handler *handler; handler = inet_diag_lock_handler(nlh->nlmsg_type); - if (!handler) - return -ENOENT; + if (IS_ERR(handler)) { + err = PTR_ERR(handler); + goto unlock; + } hashinfo = handler->idiag_hashinfo; err = -EINVAL; @@ -708,8 +710,8 @@ static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) struct inet_hashinfo *hashinfo; handler = inet_diag_lock_handler(cb->nlh->nlmsg_type); - if (!handler) - goto no_handler; + if (IS_ERR(handler)) + goto unlock; hashinfo = handler->idiag_hashinfo; @@ -838,7 +840,6 @@ done: cb->args[2] = num; unlock: inet_diag_unlock_handler(handler); -no_handler: return skb->len; } |