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| author | Dexuan Cui <decui@microsoft.com> | 2014-11-24 20:32:43 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-26 19:03:04 -0800 |
| commit | f6712238471a8afdbfcea482483fc121281292d8 (patch) | |
| tree | d52d8af9b315837e838a582dc3ab540023c9decb /drivers/hv/hv_balloon.c | |
| parent | 4300f26492b2438c4c1930552dfe83cb09c0ab31 (diff) | |
| download | linux-f6712238471a8afdbfcea482483fc121281292d8.tar.gz linux-f6712238471a8afdbfcea482483fc121281292d8.tar.bz2 linux-f6712238471a8afdbfcea482483fc121281292d8.zip | |
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>
Diffstat (limited to 'drivers/hv/hv_balloon.c')
| -rw-r--r-- | drivers/hv/hv_balloon.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 5e90c5d771a7..b958ded8ac7e 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -1087,10 +1087,12 @@ static void balloon_up(struct work_struct *dummy) 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 @@ static void balloon_up(struct work_struct *dummy) 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; |