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| author | J. Bruce Fields | 2012-02-13 22:56:19 +0100 |
|---|---|---|
| committer | J. Bruce Fields | 2012-02-14 23:01:58 +0100 |
| commit | bf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f (patch) | |
| tree | 6c36ab623d4f5cb2ce9606ffa3f1dd53b3550848 | |
| parent | nfsd4: rearrange struct nfsd4_slot (diff) | |
| download | kernel-qcow2-linux-bf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f.tar.gz kernel-qcow2-linux-bf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f.tar.xz kernel-qcow2-linux-bf5c43c8f155e755b0fc3dfa76f9f8c6e2c0161f.zip | |
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>
| -rw-r--r-- | fs/nfsd/nfs4state.c | 8 | ||||
| -rw-r--r-- | fs/nfsd/state.h | 1 |
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index e0e706f8918d..2387791ea050 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 122217fe9155..d8f52a0f4988 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[]; }; |