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| author | Minchan Kim | 2015-12-28 00:35:12 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin | 2016-01-12 19:47:05 +0100 |
| commit | f68b992bbb474641881932c61c92dcfa6f5b3689 (patch) | |
| tree | 56685b8b2bb7e93b7c8c96785076cf14baab50dd /mm/balloon_compaction.c | |
| parent | s390: more efficient smp barriers (diff) | |
| download | kernel-qcow2-linux-f68b992bbb474641881932c61c92dcfa6f5b3689.tar.gz kernel-qcow2-linux-f68b992bbb474641881932c61c92dcfa6f5b3689.tar.xz kernel-qcow2-linux-f68b992bbb474641881932c61c92dcfa6f5b3689.zip | |
virtio_balloon: fix race by fill and leak
During my compaction-related stuff, I encountered a bug
with ballooning.
With repeated inflating and deflating cycle, guest memory(
ie, cat /proc/meminfo | grep MemTotal) is decreased and
couldn't be recovered.
The reason is balloon_lock doesn't cover release_pages_balloon
so struct virtio_balloon fields could be overwritten by race
of fill_balloon(e,g, vb->*pfns could be critical).
This patch fixes it in my test.
Cc: <stable@vger.kernel.org>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'mm/balloon_compaction.c')
0 files changed, 0 insertions, 0 deletions