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authorJ. Bruce Fields <bfields@redhat.com>2012-02-13 16:56:19 -0500
committerJ. Bruce Fields <bfields@redhat.com>2012-02-14 17:01:58 -0500
commitbf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f (patch)
tree6c36ab623d4f5cb2ce9606ffa3f1dd53b3550848 /fs/nfsd
parent73e79482b40fb6671915e3da0d178862a07ef254 (diff)
downloadop-kernel-dev-bf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f.zip
op-kernel-dev-bf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f.tar.gz
nfsd4: check for uninitialized slot
This fixes an oops when a buggy client tries to use an initial seqid of 0 on a new slot, which we may misinterpret as a replay. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c8
-rw-r--r--fs/nfsd/state.h1
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e0e706f..2387791 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1347,6 +1347,7 @@ nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
slot->sl_opcnt = resp->opcnt;
slot->sl_status = resp->cstate.status;
+ slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
if (nfsd4_not_cached(resp)) {
slot->sl_datalen = 0;
return;
@@ -1916,6 +1917,9 @@ nfsd4_sequence(struct svc_rqst *rqstp,
status = check_slot_seqid(seq->seqid, slot->sl_seqid,
slot->sl_flags & NFSD4_SLOT_INUSE);
if (status == nfserr_replay_cache) {
+ status = nfserr_seq_misordered;
+ if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
+ goto out;
cstate->slot = slot;
cstate->session = session;
/* Return the cached reply status and set cstate->status
@@ -1932,9 +1936,11 @@ nfsd4_sequence(struct svc_rqst *rqstp,
/* Success! bump slot seqid */
slot->sl_seqid = seq->seqid;
- slot->sl_flags = NFSD4_SLOT_INUSE;
+ slot->sl_flags |= NFSD4_SLOT_INUSE;
if (seq->cachethis)
slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
+ else
+ slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
cstate->slot = slot;
cstate->session = session;
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 122217f..d8f52a0 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -134,6 +134,7 @@ struct nfsd4_slot {
u16 sl_opcnt;
#define NFSD4_SLOT_INUSE (1 << 0)
#define NFSD4_SLOT_CACHETHIS (1 << 1)
+#define NFSD4_SLOT_INITIALIZED (1 << 2)
u8 sl_flags;
char sl_data[];
};
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