4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> commit 11d49e9d089ccec81be87c2386dfdd010d7f7f6e upstream. we are advancing sg as we go, so the pages we need to drop in case of error are *before* the current sg. Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/vhost/scsi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -703,6 +703,7 @@ vhost_scsi_iov_to_sgl(struct vhost_scsi_ struct scatterlist *sg, int sg_count) { size_t off = iter->iov_offset; + struct scatterlist *p = sg; int i, ret; for (i = 0; i < iter->nr_segs; i++) { @@ -711,8 +712,8 @@ vhost_scsi_iov_to_sgl(struct vhost_scsi_ ret = vhost_scsi_map_to_sgl(cmd, base, len, sg, write); if (ret < 0) { - for (i = 0; i < sg_count; i++) { - struct page *page = sg_page(&sg[i]); + while (p < sg) { + struct page *page = sg_page(p++); if (page) put_page(page); }