diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-06-16 13:57:32 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-06-22 13:21:18 -0400 |
| commit | b76ce56192bcf618013fb9aecd83488cffd645cc (patch) | |
| tree | 1a071da8b3e4fcc1fbfe67c99cc622372502edb2 /net/sunrpc | |
| parent | f799bdb355edaabd81b778087613409a8932fbe9 (diff) | |
| download | linux-b76ce56192bcf618013fb9aecd83488cffd645cc.tar.gz | |
SUNRPC: Fix a re-entrancy bug in xs_tcp_read_calldir()
If the attempt to read the calldir fails, then instead of storing the read
bytes, we currently discard them. This leads to a garbage final result when
upon re-entry to the same routine, we read the remaining bytes.
Fixes the regression in bugzilla number 16213. Please see
https://bugzilla.kernel.org/show_bug.cgi?id=16213
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprtsock.c | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 2a9675136c68..7ca65c7005ea 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -210,7 +210,8 @@ struct sock_xprt { * State of TCP reply receive */ __be32 tcp_fraghdr, - tcp_xid; + tcp_xid, + tcp_calldir; u32 tcp_offset, tcp_reclen; @@ -927,7 +928,7 @@ static inline void xs_tcp_read_calldir(struct sock_xprt *transport, { size_t len, used; u32 offset; - __be32 calldir; + char *p; /* * We want transport->tcp_offset to be 8 at the end of this routine @@ -936,26 +937,33 @@ static inline void xs_tcp_read_calldir(struct sock_xprt *transport, * transport->tcp_offset is 4 (after having already read the xid). */ offset = transport->tcp_offset - sizeof(transport->tcp_xid); - len = sizeof(calldir) - offset; + len = sizeof(transport->tcp_calldir) - offset; dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); - used = xdr_skb_read_bits(desc, &calldir, len); + p = ((char *) &transport->tcp_calldir) + offset; + used = xdr_skb_read_bits(desc, p, len); transport->tcp_offset += used; if (used != len) return; transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; - transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; - transport->tcp_flags |= TCP_RCV_COPY_DATA; /* * We don't yet have the XDR buffer, so we will write the calldir * out after we get the buffer from the 'struct rpc_rqst' */ - if (ntohl(calldir) == RPC_REPLY) + switch (ntohl(transport->tcp_calldir)) { + case RPC_REPLY: + transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; + transport->tcp_flags |= TCP_RCV_COPY_DATA; transport->tcp_flags |= TCP_RPC_REPLY; - else + break; + case RPC_CALL: + transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; + transport->tcp_flags |= TCP_RCV_COPY_DATA; transport->tcp_flags &= ~TCP_RPC_REPLY; - dprintk("RPC: reading %s CALL/REPLY flag %08x\n", - (transport->tcp_flags & TCP_RPC_REPLY) ? - "reply for" : "request with", calldir); + break; + default: + dprintk("RPC: invalid request message type\n"); + xprt_force_disconnect(&transport->xprt); + } xs_tcp_check_fraghdr(transport); } @@ -975,12 +983,10 @@ static inline void xs_tcp_read_common(struct rpc_xprt *xprt, /* * Save the RPC direction in the XDR buffer */ - __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? - htonl(RPC_REPLY) : 0; - memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, - &calldir, sizeof(calldir)); - transport->tcp_copied += sizeof(calldir); + &transport->tcp_calldir, + sizeof(transport->tcp_calldir)); + transport->tcp_copied += sizeof(transport->tcp_calldir); transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; } |