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Commit 1e0f7a21 authored by Roger Pau Monne's avatar Roger Pau Monne Committed by Konrad Rzeszutek Wilk
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xen-blkback: check the number of iovecs before allocating a bios 



With the introduction of indirect segments we can receive requests
with a number of segments bigger than the maximum number of allowed
iovecs in a bios, so make sure that blkback doesn't try to allocate a
bios with more iovecs than BIO_MAX_PAGES

Signed-off-by: default avatarRoger Pau Monné <roger.pau@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 294caaf2

drivers/block/xen-blkback/blkback.c

+2 −1
Original line number Diff line number Diff line
@@ -1247,7 +1247,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, 
				     seg[i].nsec << 9,

				     seg[i].offset) == 0)) {



			bio = bio_alloc(GFP_KERNEL, nseg-i);

			int nr_iovecs = min_t(int, (nseg-i), BIO_MAX_PAGES);

			bio = bio_alloc(GFP_KERNEL, nr_iovecs);

			if (unlikely(bio == NULL))

				goto fail_put_bio;