NFSD: fix a leak which can cause CREATE_SESSION failures

check_forechannel_attrs gets drc memory, so nfsd must put it when
check_backchannel_attrs fails.

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>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1aed9be..9a6d088 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1915,7 +1915,7 @@ 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)