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| author | Eiichi Tsukata <devel@etsukata.com> | 2019-12-23 18:06:32 +0900 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-01-27 17:19:53 +0100 |
| commit | fb574de81bfdd71fdb0315105a3a7761efb68395 (patch) | |
| tree | 10418652d29eeb0538dac4d58d9245af8c8da5a3 /block/backup-top.c | |
| parent | 9b8c59e7610b9c5315ef093d801843dbe8debfac (diff) | |
| download | qemu-fb574de81bfdd71fdb0315105a3a7761efb68395.zip qemu-fb574de81bfdd71fdb0315105a3a7761efb68395.tar.gz qemu-fb574de81bfdd71fdb0315105a3a7761efb68395.tar.bz2 | |
block/backup: fix memory leak in bdrv_backup_top_append()
bdrv_open_driver() allocates bs->opaque according to drv->instance_size.
There is no need to allocate it and overwrite opaque in
bdrv_backup_top_append().
Reproducer:
$ QTEST_QEMU_BINARY=./x86_64-softmmu/qemu-system-x86_64 valgrind -q --leak-check=full tests/test-replication -p /replication/secondary/start
==29792== 24 bytes in 1 blocks are definitely lost in loss record 52 of 226
==29792== at 0x483AB1A: calloc (vg_replace_malloc.c:762)
==29792== by 0x4B07CE0: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.6000.7)
==29792== by 0x12BAB9: bdrv_open_driver (block.c:1289)
==29792== by 0x12BEA9: bdrv_new_open_driver (block.c:1359)
==29792== by 0x1D15CB: bdrv_backup_top_append (backup-top.c:190)
==29792== by 0x1CC11A: backup_job_create (backup.c:439)
==29792== by 0x1CD542: replication_start (replication.c:544)
==29792== by 0x1401B9: replication_start_all (replication.c:52)
==29792== by 0x128B50: test_secondary_start (test-replication.c:427)
...
Fixes: 7df7868b9640 ("block: introduce backup-top filter driver")
Signed-off-by: Eiichi Tsukata <devel@etsukata.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/backup-top.c')
| -rw-r--r-- | block/backup-top.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/backup-top.c b/block/backup-top.c index b8d863f..9aed2eb 100644 --- a/block/backup-top.c +++ b/block/backup-top.c @@ -196,7 +196,7 @@ BlockDriverState *bdrv_backup_top_append(BlockDriverState *source, } top->total_sectors = source->total_sectors; - top->opaque = state = g_new0(BDRVBackupTopState, 1); + state = top->opaque; bdrv_ref(target); state->target = bdrv_attach_child(top, target, "target", &child_file, errp); |