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: Roger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -1247,7 +1247,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
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seg[i].nsec << 9,
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seg[i].nsec << 9,
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seg[i].offset) == 0)) {
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seg[i].offset) == 0)) {
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bio = bio_alloc(GFP_KERNEL, nseg-i);
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int nr_iovecs = min_t(int, (nseg-i), BIO_MAX_PAGES);
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bio = bio_alloc(GFP_KERNEL, nr_iovecs);
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if (unlikely(bio == NULL))
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if (unlikely(bio == NULL))
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goto fail_put_bio;
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goto fail_put_bio;
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