[v3,21/41] fsl_hypervisor: convert put_page() to put_user_page*()

Commit Message

[e-mail] Aug. 7, 2019, 1:33 a.m. UTC

From: John Hubbard <[e-mail]>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

This changes the release code slightly, because each page slot in the
page_list[] array is no longer checked for NULL. However, that check
was wrong anyway, because the get_user_pages() pattern of usage here
never allowed for NULL entries within a range of pinned pages.

Cc: Al Viro <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: Rob Herring <[e-mail]>
Signed-off-by: John Hubbard <[e-mail]>
---
 drivers/virt/fsl_hypervisor.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/virt/fsl_hypervisor.c b/drivers/virt/fsl_hypervisor.c
index 93d5bebf9572..a8f78d572c45 100644
--- a/drivers/virt/fsl_hypervisor.c
+++ b/drivers/virt/fsl_hypervisor.c
@@ -292,11 +292,8 @@  static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
 		virt_to_phys(sg_list), num_pages);
 
 exit:
-	if (pages) {
-		for (i = 0; i < num_pages; i++)
-			if (pages[i])
-				put_page(pages[i]);
-	}
+	if (pages)
+		put_user_pages(pages, num_pages);
 
 	kfree(sg_list_unaligned);
 	kfree(pages);