nfs4: limit callback decoding to received bytes

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commit 38b7631fbe upstream.

A truncated cb_compound request will cause the client to decode null or
data from a previous callback for nfs4.1 backchannel case, or uninitialized
data for the nfs4.0 case. This is because the path through
svc_process_common() advances the request's iov_base and decrements iov_len
without adjusting the overall xdr_buf's len field.  That causes
xdr_init_decode() to set up the xdr_stream with an incorrect length in
nfs4_callback_compound().

Fixing this for the nfs4.1 backchannel case first requires setting the
correct iov_len and page_len based on the length of received data in the
same manner as the nfs4.0 case.

Then the request's xdr_buf length can be adjusted for both cases based upon
the remaining iov_len and page_len.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Benjamin Coddington 2015-11-20 09:55:30 -05:00 • committed by Luis Henriques

parent 1962eb806c

commit 169c69de70

3 changed files with 14 additions and 2 deletions

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7

fs/nfs/callback_xdr.c

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8

net/sunrpc/backchannel_rqst.c

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1

net/sunrpc/svc.c

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