hv: hv_balloon: avoid memory leak on alloc_error of 2MB memory block
If num_ballooned is not 0, we shouldn't neglect the
already-partially-allocated 2MB memory block(s).
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 5e90c5d..b958ded 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1087,10 +1087,12 @@
struct dm_balloon_response *bl_resp;
int alloc_unit;
int ret;
- bool alloc_error = false;
+ bool alloc_error;
bool done = false;
int i;
+ /* The host balloons pages in 2M granularity. */
+ WARN_ON_ONCE(num_pages % PAGES_IN_2M != 0);
/*
* We will attempt 2M allocations. However, if we fail to
@@ -1107,16 +1109,18 @@
num_pages -= num_ballooned;
+ alloc_error = false;
num_ballooned = alloc_balloon_pages(&dm_device, num_pages,
bl_resp, alloc_unit,
&alloc_error);
- if ((alloc_error) && (alloc_unit != 1)) {
+ if (alloc_unit != 1 && num_ballooned == 0) {
alloc_unit = 1;
continue;
}
- if ((alloc_error) || (num_ballooned == num_pages)) {
+ if ((alloc_unit == 1 && alloc_error) ||
+ (num_ballooned == num_pages)) {
bl_resp->more_pages = 0;
done = true;
dm_device.state = DM_INITIALIZED;