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Commit 11d49e9d authored by Al Viro's avatar Al Viro
Browse files

fix a page leak in vhost_scsi_iov_to_sgl() error recovery 



we are advancing sg as we go, so the pages we need to drop in
case of error are *before* the current sg.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 09cf698a

drivers/vhost/scsi.c

+3 −2
Original line number Diff line number Diff line
@@ -688,6 +688,7 @@ vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, 
		      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++) {
@@ -696,8 +697,8 @@ vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, 


		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);

			}