balloon_wrk.num_pages is __u32 and it comes from host in struct dm_balloon
where it is also __u32. We, however, use 'int' in balloon_up() and in case
we happen to receive num_pages>INT_MAX request we'll end up allocating zero
pages as 'num_pages < alloc_unit' check in alloc_balloon_pages() will pass.
Change num_pages type to unsigned int.
In real life ballooning request come with num_pages in [512, 32768] range so
this is more a future-proof/cleanup.
Reported-by: Laszlo Ersek <lersek@xxxxxxxxxx>
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
drivers/hv/hv_balloon.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 20bfe36..35312e1 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1071,11 +1071,12 @@ static void free_balloon_pages(struct hv_dynmem_device *dm,
-static int alloc_balloon_pages(struct hv_dynmem_device *dm, int num_pages,
- struct dm_balloon_response *bl_resp,
- int alloc_unit)
+static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
+ unsigned int num_pages,
+ struct dm_balloon_response *bl_resp,
+ int alloc_unit)
{
- int i = 0;
+ unsigned int i = 0;
struct page *pg;
if (num_pages < alloc_unit)
@@ -1122,8 +1123,8 @@ static int alloc_balloon_pages(struct hv_dynmem_device *dm, int num_pages,
static void balloon_up(struct work_struct *dummy)
{
- int num_pages = dm_device.balloon_wrk.num_pages;
- int num_ballooned = 0;
+ unsigned int num_pages = dm_device.balloon_wrk.num_pages;
+ unsigned int num_ballooned = 0;
struct dm_balloon_response *bl_resp;
int alloc_unit;
int ret;
--
1.9.3
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