[Qemu-stable] [PATCH 3/7] scsi-generic: check the return value of bdrv_aio_ioctl in execute_command

[Paolo Bonzini]

From: Pavel Hrdina <address@hidden>

This fixes the bug introduced by this commit ad54ae80c73f.
The bdrv_aio_ioctl() still could return null and we should return an error
in that case.

Cc: address@hidden
Signed-off-by: Pavel Hrdina <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 hw/scsi/scsi-generic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 19bd36c..8f195be 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -174,6 +174,9 @@ static int execute_command(BlockDriverState *bdrv,
     r->io_header.flags |= SG_FLAG_DIRECT_IO;
 
     r->req.aiocb = bdrv_aio_ioctl(bdrv, SG_IO, &r->io_header, complete, r);
+    if (r->req.aiocb == NULL) {
+        return -EIO;
+    }
 
     return 0;
 }
-- 
1.8.1.4