diff options
| author | Kevin Wolf <mail@kevin-wolf.de> | 2010-09-10 12:27:03 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2010-09-21 15:39:42 +0200 |
| commit | 9217e26f43df4aab7deaea35b21caacc1f1f854b (patch) | |
| tree | 49a5d0c5ac30f47465d93489d7933b418c8eda2a /block/vvfat.c | |
| parent | ac48e389d073bf2c8703745eef4824fabe0427ba (diff) | |
vvfat: Fix double free for opening the image rw
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 <mail@kevin-wolf.de>
Diffstat (limited to 'block/vvfat.c')
| -rw-r--r-- | block/vvfat.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/block/vvfat.c b/block/vvfat.c index 5898d664b0..07720371c9 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; } |