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| author | J. Bruce Fields <bfields@citi.umich.edu> | 2010-05-01 20:56:06 +0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2010-05-08 03:08:47 +0400 |
| commit | 5d4cec2f2fdbb3d830fa014226d0d965df548bad (patch) | |
| tree | f5cb399d4fc29aec57e700d2b77731fe68e4a537 /fs/nfsd | |
| parent | 5306293c9cd2caf41849cc909281bda628bb989e (diff) | |
| download | linux-5d4cec2f2fdbb3d830fa014226d0d965df548bad.tar.xz | |
nfsd4: fix bare destroy_session null dereference
It's legal to send a DESTROY_SESSION outside any session (as the only
operation in a compound), in which case cstate->session will be NULL;
check for that case.
While we're at it, move these checks into a separate helper function.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index f05a3276ba6b..835d6cef9ae9 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1352,6 +1352,13 @@ static bool nfsd4_last_compound_op(struct svc_rqst *rqstp) return argp->opcnt == resp->opcnt; } +static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) +{ + if (!session) + return 0; + return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); +} + __be32 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate, @@ -1367,8 +1374,7 @@ nfsd4_destroy_session(struct svc_rqst *r, * - Do we need to clear any callback info from previous session? */ - if (!memcmp(&sessionid->sessionid, &cstate->session->se_sessionid, - sizeof(struct nfs4_sessionid))) { + if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { if (!nfsd4_last_compound_op(r)) return nfserr_not_only_op; } |