From: Kevin Wolf <m...@kevin-wolf.de>
Allocation and deallocation of bs->opaque is not in the control of a
block driver. Therefore it should not set bs->opaque to a data structure
used by another bs, or closing the image will lead to a double free.
Signed-off-by: Kevin Wolf <m...@kevin-wolf.de>
---
block/vvfat.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/block/vvfat.c b/block/vvfat.c
index 5898d66..0772037 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2768,12 +2768,12 @@ static int vvfat_is_allocated(BlockDriverState *bs,
static int write_target_commit(BlockDriverState *bs, int64_t sector_num,
const uint8_t* buffer, int nb_sectors) {
- BDRVVVFATState* s = bs->opaque;
+ BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
return try_commit(s);
}
static void write_target_close(BlockDriverState *bs) {
- BDRVVVFATState* s = bs->opaque;
+ BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
bdrv_delete(s->qcow);
free(s->qcow_filename);
}
@@ -2816,7 +2816,8 @@ static int enable_write_target(BDRVVVFATState *s)
s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1);
s->bs->backing_hd->drv = &vvfat_write_target;
- s->bs->backing_hd->opaque = s;
+ s->bs->backing_hd->opaque = qemu_malloc(sizeof(void*));
+ *(void**)s->bs->backing_hd->opaque = s;
return 0;
}
--
1.7.2.2
