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nfs4: fix discover_server_trunking use after free 

If clp is new (cl_count = 1) and it matches another client in
nfs4_discover_server_trunking, the nfs_put_client will free clp before
->cl_preserve_clid is set.

Cc: stable@vger.kernel.org # 3.7+
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Weston Andros Adamson 2014-01-19 22:45:36 -05:00 committed by Trond Myklebust
parent 64590daa9e
commit abad2fa5ba
1 changed files with 4 additions and 6 deletions
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10
fs/nfs/nfs4client.c
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@ -414,13 +414,11 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp,
error = nfs4_discover_server_trunking(clp, &old);
if (error < 0)
goto error;
nfs_put_client(clp);
if (clp != old) {
clp->cl_preserve_clid = true;
clp = old;
}
return clp;
if (clp != old)
clp->cl_preserve_clid = true;
nfs_put_client(clp);
return old;
error:
nfs_mark_client_ready(clp, error);