Messages in this thread Patch in this message | | | From | Roger Pau Monne <> | Subject | [PATCH 3/4] xen-blkback: check the number of iovecs before allocating a bios | Date | Fri, 21 Jun 2013 12:56:55 +0200 |
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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> --- drivers/block/xen-blkback/blkback.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index d622d86..876116b 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -1236,7 +1236,8 @@ 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 = (nseg-i) > BIO_MAX_PAGES ? BIO_MAX_PAGES : (nseg-i); + bio = bio_alloc(GFP_KERNEL, nr_iovecs); if (unlikely(bio == NULL)) goto fail_put_bio; -- 1.7.7.5 (Apple Git-26) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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