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sunvdc: limit each sg segment to a page

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ldc_map_sg() could fail its check that the number of pages referred to
by the sg scatterlist was <= the number of cookies.

This fixes the issue by doing a similar thing to the xen-blkfront driver,
ensuring that the scatterlist will only ever contain a segment count <=
port->ring_cookies, and each segment will be page aligned, and <= page
size. This ensures that the scatterlist is always mappable.

Orabug: 19347817
OraBZ: 15945

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dwight Engen 2014-09-19 09:42:53 -04:00 committed by David S. Miller
parent de5b73f084
commit 5eed69ffd2
1 changed files with 4 additions and 0 deletions
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4
drivers/block/sunvdc.c
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@ -747,6 +747,10 @@ static int probe_disk(struct vdc_port *port)
port->disk = g;
/* Each segment in a request is up to an aligned page in size. */
blk_queue_segment_boundary(q, PAGE_SIZE - 1);
blk_queue_max_segment_size(q, PAGE_SIZE);
blk_queue_max_segments(q, port->ring_cookies);
blk_queue_max_hw_sectors(q, port->max_xfer_size);
g->major = vdc_major;