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authorRoger Pau Monne <roger.pau@citrix.com>2013-06-22 09:59:17 +0200
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-06-25 10:00:58 -0400
commit1e0f7a21b2fffc70f27cc4a454c60321501045b1 (patch)
tree0a6eb8b048e694cc4ffb69af6f94f2bd5e8105cd /drivers/block/xen-blkback
parent294caaf29c26cfed3b446fb46393b8b39ea1c0d3 (diff)
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>
Diffstat (limited to 'drivers/block/xen-blkback')
-rw-r--r--drivers/block/xen-blkback/blkback.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 4662217c61be..bf4b9d282c04 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -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;