[ 050/108] svcrpc: sends on closed socket should stop immediately
From: Greg Kroah-Hartman
Date: Wed Sep 12 2012 - 20:35:27 EST
From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
3.5-stable review patch. If anyone has any objections, please let me know.
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
commit f06f00a24d76e168ecb38d352126fd203937b601 upstream.
svc_tcp_sendto sets XPT_CLOSE if we fail to transmit the entire reply.
However, the XPT_CLOSE won't be acted on immediately. Meanwhile other
threads could send further replies before the socket is really shut
down. This can manifest as data corruption: for example, if a truncated
read reply is followed by another rpc reply, that second reply will look
to the client like further read data.
Symptoms were data corruption preceded by svc_tcp_sendto logging
kernel: rpc-srv/tcp: nfsd: sent only 963696 when sending 1048708 bytes - shutting down socket
Reported-by: Malahal Naineni <malahal@xxxxxxxxxx>
Tested-by: Malahal Naineni <malahal@xxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/sunrpc/svc_xprt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
@@ -791,7 +791,8 @@ int svc_send(struct svc_rqst *rqstp)
/* Grab mutex to serialize outgoing data. */
- if (test_bit(XPT_DEAD, &xprt->xpt_flags))
+ if (test_bit(XPT_DEAD, &xprt->xpt_flags)
+ || test_bit(XPT_CLOSE, &xprt->xpt_flags))
len = -ENOTCONN;
len = xprt->xpt_ops->xpo_sendto(rqstp);
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