From: Ryan Harper <ry...@us.ibm.com> If the block device has been closed, we no longer have a medium to submit IO against, check for this before submitting io. This prevents a segfault further in the code where we dereference elements of the block driver.
Signed-off-by: Ryan Harper <ry...@us.ibm.com> Reviewed-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kw...@redhat.com> --- block.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/block.c b/block.c index 0559d83..c8e2f97 100644 --- a/block.c +++ b/block.c @@ -2398,6 +2398,14 @@ int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) MultiwriteCB *mcb; int i; + /* don't submit writes if we don't have a medium */ + if (bs->drv == NULL) { + for (i = 0; i < num_reqs; i++) { + reqs[i].error = -ENOMEDIUM; + } + return -1; + } + if (num_reqs == 0) { return 0; } -- 1.7.2.3