nfsd: encoders mustn't use unitialized values in error cases

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commit f961e3f2ac upstream.

In error cases, lgp->lg_layout_type may be out of bounds; so we
shouldn't be using it until after the check of nfserr.

This was seen to crash nfsd threads when the server receives a LAYOUTGET
request with a large layout type.

GETDEVICEINFO has the same problem.

Reported-by: Ari Kauppi <Ari.Kauppi@synopsys.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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J. Bruce Fields 2017-05-05 16:17:57 -04:00 • committed by Greg Kroah-Hartman

parent ea465551af

commit 51d9c51523

1 changed files with 4 additions and 4 deletions

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fs/nfsd/nfs4xdr.c

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