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authorVitaly Kuznetsov <vkuznets@redhat.com>2015-03-31 21:16:41 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-03 17:20:12 +0300
commit797f88c987b02a8de8d4fac94ec2877b92ec35a2 (patch)
treea4bb69aa6bab4b4af5778bb59e94bfcd68aa138f /drivers/hv
parentba0c444153889a9b672974d85a4a57a8eeb49fe3 (diff)
downloadlinux-797f88c987b02a8de8d4fac94ec2877b92ec35a2.tar.xz
Drivers: hv: hv_balloon: correctly handle num_pages>INT_MAX case
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@redhat.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv_balloon.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 4052ad8255fa..cb5b7dc9797f 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1081,11 +1081,12 @@ 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)
@@ -1132,8 +1133,8 @@ 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;