[PATCH for 4.2-rc5 1/1] block/qcow2-bitmap: fix crash bug in qcow2_co_remove_persistent_dirty_bitmap

[Eric Blake <eblake@redhat.com>]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Here is double bug:

First, return error but not set errp. This may lead to:
qmp block-dirty-bitmap-remove may report success when actually failed

block-dirty-bitmap-remove used in a transaction will crash, as
qmp_transaction will think that it returned success and will call
block_dirty_bitmap_remove_commit which will crash, as state->bitmap is
NULL

Second (like in anecdote), this case is not an error at all. As it is
documented in the comment above bdrv_co_remove_persistent_dirty_bitmap
definition, absence of bitmap is not an error, and similar case handled
at start of qcow2_co_remove_persistent_dirty_bitmap, it returns 0 when
there is no bitmaps at all.

But when there are some bitmaps, but not the requested one, it return
error with errp unset.

Fix that.

Trigger:
1. create persistent bitmap A
2. shutdown vm  (bitmap A is synced)
3. start vm
4. create persistent bitmap B
5. remove bitmap B - it fails (and crashes if in transaction)

Potential workaround (rather invasive to ask clients to implement it):
1. create persistent bitmap A
2. shutdown vm
3. start vm
4. create persistent bitmap B
5. remember, that we want to remove bitmap B after vm shutdown
...
  some other operations
...
6. vm shutdown
7. start vm in stopped mode, and remove all bitmaps marked for removing
8. stop vm

Fixes: b56a1e31759b750
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20191205193049.30666-1-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
[eblake: commit message tweaks]
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 block/qcow2-bitmap.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 8abaf632fc7d..c6c8ebbe89d4 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1469,8 +1469,10 @@ int coroutine_fn qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs,
     Qcow2BitmapList *bm_list;

     if (s->nb_bitmaps == 0) {
-        /* Absence of the bitmap is not an error: see explanation above
-         * bdrv_remove_persistent_dirty_bitmap() definition. */
+        /*
+         * Absence of the bitmap is not an error: see explanation above
+         * bdrv_co_remove_persistent_dirty_bitmap() definition.
+         */
         return 0;
     }

@@ -1485,7 +1487,8 @@ int coroutine_fn qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs,

     bm = find_bitmap_by_name(bm_list, name);
     if (bm == NULL) {
-        ret = -EINVAL;
+        /* Absence of the bitmap is not an error, see above. */
+        ret = 0;
         goto out;
     }

-- 
2.21.0