[xen stable-4.15] libxl: Assert qmp_ev's state in qmp_ev_qemu_compare_version

[patchbot@xxxxxxx]

commit 9cb597a5456fb88f1a3b48090e914bd05a60e740
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Tue May 11 10:28:07 2021 +0100
Commit:     Ian Jackson <iwj@xxxxxxxxxxxxxx>
CommitDate: Thu Aug 19 17:18:09 2021 +0100

    libxl: Assert qmp_ev's state in qmp_ev_qemu_compare_version
    
    We are supposed to read the version information only when qmp_ev is in
    state "Connected" (that correspond to state==qmp_state_connected),
    assert it so that the function isn't used too early.
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    
    Backport-requested-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 tools/libs/light/libxl_qmp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/libs/light/libxl_qmp.c b/tools/libs/light/libxl_qmp.c
index 9b638e6f54..d0967c9f02 100644
--- a/tools/libs/light/libxl_qmp.c
+++ b/tools/libs/light/libxl_qmp.c
@@ -292,6 +292,8 @@ static int qmp_handle_response(libxl__gc *gc, 
libxl__qmp_handler *qmp,
 static int qmp_ev_qemu_compare_version(libxl__ev_qmp *ev, int major,
                                        int minor, int micro)
 {
+    assert(ev->state == qmp_state_connected);
+
 #define CHECK_VERSION(level) do { \
     if (ev->qemu_version.level > (level)) return +1; \
     if (ev->qemu_version.level < (level)) return -1; \
--
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