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pnfs/blocklayout: off by one in bl_map_stripe()

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commit 0914bb965e38a055e9245637aed117efbe976e91 upstream.

"dev->nr_children" is the number of children which were parsed
successfully in bl_parse_stripe().  It could be all of them and then, in
that case, it is equal to v->stripe.volumes_count.  Either way, the >
should be >= so that we don't go beyond the end of what we're supposed
to.

Fixes: 5c83746a0cf2 ("pnfs/blocklayout: in-kernel GETDEVICEINFO XDR parsing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # 3.17+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2018-07-04 12:59:58 +03:00 committed by Greg Kroah-Hartman
parent 6ee996baf1
commit f7169718de
1 changed files with 1 additions and 1 deletions
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fs/nfs/blocklayout/dev.c
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@ -204,7 +204,7 @@ static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
chunk = div_u64(offset, dev->chunk_size);
div_u64_rem(chunk, dev->nr_children, &chunk_idx);
if (chunk_idx > dev->nr_children) {
if (chunk_idx >= dev->nr_children) {
dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
__func__, chunk_idx, offset, dev->chunk_size);
/* error, should not happen */