[PATCH] block/mirror: fix NULL pointer dereference in mirror_wait_on_conflicts()

[Stefano Garzarella <sgarzare@redhat.com>]

In mirror_iteration() we call mirror_wait_on_conflicts() with
`self` parameter set to NULL.

Starting from commit d44dae1a7c we dereference `self` pointer in
mirror_wait_on_conflicts() without checks if it is not NULL.

Backtrace:
  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  mirror_wait_on_conflicts (self=0x0, s=<optimized out>, offset=<optimized out>, bytes=<optimized out>)
      at ../block/mirror.c:172
  172	                self->waiting_for_op = op;
  [Current thread is 1 (Thread 0x7f0908931ec0 (LWP 380249))]
  (gdb) bt
  #0  mirror_wait_on_conflicts (self=0x0, s=<optimized out>, offset=<optimized out>, bytes=<optimized out>)
      at ../block/mirror.c:172
  #1  0x00005610c5d9d631 in mirror_run (job=0x5610c76a2c00, errp=<optimized out>) at ../block/mirror.c:491
  #2  0x00005610c5d58726 in job_co_entry (opaque=0x5610c76a2c00) at ../job.c:917
  #3  0x00005610c5f046c6 in coroutine_trampoline (i0=<optimized out>, i1=<optimized out>)
      at ../util/coroutine-ucontext.c:173
  #4  0x00007f0909975820 in ?? () at ../sysdeps/unix/sysv/linux/x86_64/__start_context.S:91
      from /usr/lib64/libc.so.6

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2001404
Fixes: d44dae1a7c ("block/mirror: fix active mirror dead-lock in mirror_wait_on_conflicts")
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
I'm not familiar with this code so maybe we can fix the bug differently.

Running iotests and the test in bugzilla, everything seems okay.

Thanks,
Stefano
---
 block/mirror.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 98fc66eabf..6c834d6a7b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -169,9 +169,16 @@ static void coroutine_fn mirror_wait_on_conflicts(MirrorOp *self,
                     continue;
                 }
 
-                self->waiting_for_op = op;
+                if (self) {
+                    self->waiting_for_op = op;
+                }
+
                 qemu_co_queue_wait(&op->waiting_requests, NULL);
-                self->waiting_for_op = NULL;
+
+                if (self) {
+                    self->waiting_for_op = NULL;
+                }
+
                 break;
             }
         }
-- 
2.31.1