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nfsd4: check for uninitialized slot

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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>
This commit is contained in:
J. Bruce Fields 2012-02-13 16:56:19 -05:00
parent 73e79482b4
commit bf5c43c8f1
2 changed files with 8 additions and 1 deletions
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8
fs/nfsd/nfs4state.c
View File

@ -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;

1
fs/nfsd/state.h
View File

@ -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[];
};