[PATCH] NFSD: fix a bug which causing nfsd deny CREATE_SESSION

[Kinglong Mee <kinglongmee@gmail.com>]

check_forechannel_attrs have get drc memory, 
nfsd must put it when check_backchannel_attrs failed.

After many requests with bad back channel attrs, 
nfsd will deny any client's CREATE_SESSION forever.

A new test case named CSESS29 for pynfs will send in another mail.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
---
 fs/nfsd/nfs4state.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 105d6fa..4e2c9ba 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1913,7 +1913,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 		return status;
 	status = check_backchannel_attrs(&cr_ses->back_channel);
 	if (status)
-		return status;
+		goto out_release_drc_mem;
 	status = nfserr_jukebox;
 	new = alloc_session(&cr_ses->fore_channel);
 	if (!new)
-- 
1.8.4.2