sunrpc: correct the computation for page_ptr when truncating

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commit 5d7a5bcb67 upstream.

When truncating the encode buffer, the page_ptr is getting
advanced, causing the next page to be skipped while encoding.
The page is still included in the response, so the response
contains a page of bogus data.

We need to adjust the page_ptr backwards to ensure we encode
the next page into the correct place.

We saw this triggered when concurrent directory modifications caused
nfsd4_encode_direct_fattr() to return nfserr_noent, and the resulting
call to xdr_truncate_encode() corrupted the READDIR reply.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Frank Sorenson 2018-10-30 15:10:40 -05:00 • committed by Greg Kroah-Hartman

parent 401182ae09

commit 03c91663c0

1 changed files with 2 additions and 3 deletions

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net/sunrpc/xdr.c

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