File 0239-IDE-Do-not-flush-empty-CDROM-drives.patch of Package qemu.20361

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File 0239-IDE-Do-not-flush-empty-CDROM-drives.patch of Package qemu.20361

From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Wed, 9 Aug 2017 17:02:11 +0100
Subject: IDE: Do not flush empty CDROM drives

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 <jsnow@redhat.com>.

Reported-by: Kieron Shorrock <kshorrock@paloaltonetworks.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20170809160212.29976-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 4da97120d51a4383aa96d741a2b837f8c4bbcd0b)
[FL: BSC#1054724 CVE-2017-12809]
Signed-off-by: Fei Li <fli@suse.com>
---
 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 37d6562962c645f17b871a50ade3..b5fcdb0fd6bb3a558ce47e8257aa 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1049,7 +1049,15 @@ static void ide_flush_cache(IDEState *s)
 
     s->status |= BUSY_STAT;
     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)

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File 0239-IDE-Do-not-flush-empty-CDROM-drives.patch of Package qemu.20361

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