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http://openwall.com/lists/oss-security/2017/08/21/2
https://lists.gnu.org/archive/html/qemu-devel/2017-08/msg01850.html
The block backend changed in a way that flushing empty CDROM drives now
crashes. Amend IDE to avoid doing so until the root problem can be
addressed for 2.11.
Original patch by John Snow <address@hidden>.
Reported-by: Kieron Shorrock <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
hw/ide/core.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 0b48b64d3a..bea39536b0 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1063,7 +1063,15 @@ static void ide_flush_cache(IDEState *s)
s->status |= BUSY_STAT;
ide_set_retry(s);
block_acct_start(blk_get_stats(s->blk), &s->acct, 0, BLOCK_ACCT_FLUSH);
- s->pio_aiocb = blk_aio_flush(s->blk, ide_flush_cb, s);
+
+ if (blk_bs(s->blk)) {
+ s->pio_aiocb = blk_aio_flush(s->blk, ide_flush_cb, s);
+ } else {
+ /* XXX blk_aio_flush() crashes when blk_bs(blk) is NULL, remove this
+ * temporary workaround when blk_aio_*() functions handle NULL blk_bs.
+ */
+ ide_flush_cb(s, 0);
+ }
}
static void ide_cfata_metadata_inquiry(IDEState *s)
--
2.13.3
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