[PATCH 0/2] block/export: Fix crash on error after iothread conflict

[Max Reitz]

Hi,

By passing the @iothread option to block-export-add, the new export can
be moved to the given iothread.  This may conflict with an existing
parent of the node in question.  How this conflict is resolved, depends
on @fixed-iothread: If that option is true, the error is fatal and
block-export-add fails.  If it is false, the error is ignored and the
node stays in its original iothread.

However, in the implementation, the ignored error is still in *errp, and
so if a second error occurs afterwards and tries to put something into
*errp, that will fail an assertion.

To really ignore the error, we have to free it and clear *errp (with an
ERRP_GUARD()).

Patch 1 is the fix, patch 2 a regression test.


Max Reitz (2):
  block/export: Free ignored Error
  iotests/307: Test iothread conflict for exports

 block/export/export.c      |  4 ++++
 tests/qemu-iotests/307     | 15 +++++++++++++++
 tests/qemu-iotests/307.out |  8 ++++++++
 3 files changed, 27 insertions(+)

-- 
2.30.2