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| author | Roger Pau Monne <roger.pau@citrix.com> | 2013-06-22 11:59:17 +0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-06-25 18:00:58 +0400 |
| commit | 1e0f7a21b2fffc70f27cc4a454c60321501045b1 (patch) | |
| tree | 0a6eb8b048e694cc4ffb69af6f94f2bd5e8105cd /drivers/block | |
| parent | 294caaf29c26cfed3b446fb46393b8b39ea1c0d3 (diff) | |
| download | linux-1e0f7a21b2fffc70f27cc4a454c60321501045b1.tar.xz | |
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')
| -rw-r--r-- | 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 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; |