File 0168-scsi-disk-fix-double-completion-of-.patch of Package qemu-linux-user.20749

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File 0168-scsi-disk-fix-double-completion-of-.patch of Package qemu-linux-user.20749

From: Paolo Bonzini <pbonzini@redhat.com>
Date: Sat, 13 Oct 2018 11:49:16 +0200
Subject: scsi-disk: fix double completion of failing passthrough requests

If a command fails with a sense that scsi_sense_buf_to_errno converts to
ECANCELED/EAGAIN/ENOTCONN or with a unit attention, scsi_req_complete is
called twice.  This caused a crash.

Reported-by: Wangguang <wang.guangA@h3c.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit e6aa5ba4ac423dd282c831402110970ee278392e)
[LM: BSC#1154790]
Signed-off-by: Lin Ma <lma@suse.com>
---
 hw/scsi/scsi-disk.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 5e4d2c38f0975671be71dad01877..c26d2d9c5533a123a80d77508605 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -440,9 +440,18 @@ static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
         }
         switch (error) {
         case 0:
-            /* The command has run, no need to fake sense.  */
+            /* A passthrough command has run and has produced sense data; check
+             * whether the error has to be handled by the guest or should rather
+             * pause the host.
+             */
             assert(r->status && *r->status);
-            scsi_req_complete(&r->req, *r->status);
+            error = scsi_sense_buf_to_errno(r->req.sense, sizeof(r->req.sense));
+            if (error == ECANCELED || error == EAGAIN || error == ENOTCONN ||
+                error == 0)  {
+                /* These errors are handled by guest. */
+                scsi_req_complete(&r->req, *r->status);
+                return true;
+            }
             break;
         case ENOMEDIUM:
             scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));
@@ -461,17 +470,6 @@ static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
             break;
         }
     }
-    if (!error) {
-        assert(r->status && *r->status);
-        error = scsi_sense_buf_to_errno(r->req.sense, sizeof(r->req.sense));
-
-        if (error == ECANCELED || error == EAGAIN || error == ENOTCONN ||
-            error == 0)  {
-            /* These errors are handled by guest. */
-            scsi_req_complete(&r->req, *r->status);
-            return true;
-        }
-    }
 
     blk_error_action(s->qdev.conf.blk, action, is_read, error);
     if (action == BLOCK_ERROR_ACTION_STOP) {

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File 0168-scsi-disk-fix-double-completion-of-.patch of Package qemu-linux-user.20749

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