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| author | J. Bruce Fields <bfields@redhat.com> | 2012-08-20 16:04:40 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2012-08-20 18:38:59 -0400 |
| commit | f06f00a24d76e168ecb38d352126fd203937b601 (patch) | |
| tree | 14dc65ebb5dc175f68a099f0aaf36b447e1fdcd8 /net | |
| parent | be1e44441a560c43c136a562d49a1c9623c91197 (diff) | |
| download | linux-f06f00a24d76e168ecb38d352126fd203937b601.tar.gz linux-f06f00a24d76e168ecb38d352126fd203937b601.tar.bz2 linux-f06f00a24d76e168ecb38d352126fd203937b601.zip | |
svcrpc: sends on closed socket should stop immediately
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
something like
kernel: rpc-srv/tcp: nfsd: sent only 963696 when sending 1048708 bytes - shutting down socket
Cc: stable@vger.kernel.org
Reported-by: Malahal Naineni <malahal@us.ibm.com>
Tested-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/svc_xprt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index 88f2bf671960..0d693a89434f 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -794,7 +794,8 @@ int svc_send(struct svc_rqst *rqstp) /* Grab mutex to serialize outgoing data. */ mutex_lock(&xprt->xpt_mutex); - 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; else len = xprt->xpt_ops->xpo_sendto(rqstp); |