[spice-server v2 5/9] qxl: Fix guest resources release in red_put_drawable()

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

At the moment, we'll unconditionally release the guest QXL resources in
red_put_drawable() even if red_get_drawable() failed and did not
initialize drawable->release_info_ext properly.
This commit checks the QXLReleaseInfo in release_info_ext is non-0
before attempting to release it.

Signed-off-by: Christophe Fergeau <cfergeau@xxxxxxxxxx>
---
 server/red-parse-qxl.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/server/red-parse-qxl.c b/server/red-parse-qxl.c
index cc6a8b51d..ccb01d92d 100644
--- a/server/red-parse-qxl.c
+++ b/server/red-parse-qxl.c
@@ -1012,7 +1012,7 @@ static void red_put_clip(SpiceClip *red)
     }
 }
 
-static bool red_get_native_drawable(RedMemSlotInfo *slots, int group_id,
+static bool red_get_native_drawable(QXLInstance *qxl_instance, RedMemSlotInfo *slots, int group_id,
                                     RedDrawable *red, QXLPHYSICAL addr, uint32_t flags)
 {
     QXLDrawable *qxl;
@@ -1023,6 +1023,7 @@ static bool red_get_native_drawable(RedMemSlotInfo *slots, int group_id,
     if (error) {
         return false;
     }
+    red->qxl = qxl_instance;
     red->release_info_ext.info     = &qxl->release_info;
     red->release_info_ext.group_id = group_id;
 
@@ -1093,7 +1094,7 @@ static bool red_get_native_drawable(RedMemSlotInfo *slots, int group_id,
     return true;
 }
 
-static bool red_get_compat_drawable(RedMemSlotInfo *slots, int group_id,
+static bool red_get_compat_drawable(QXLInstance *qxl_instance, RedMemSlotInfo *slots, int group_id,
                                     RedDrawable *red, QXLPHYSICAL addr, uint32_t flags)
 {
     QXLCompatDrawable *qxl;
@@ -1103,6 +1104,7 @@ static bool red_get_compat_drawable(RedMemSlotInfo *slots, int group_id,
     if (error) {
         return false;
     }
+    red->qxl = qxl_instance;
     red->release_info_ext.info     = &qxl->release_info;
     red->release_info_ext.group_id = group_id;
 
@@ -1176,15 +1178,16 @@ static bool red_get_compat_drawable(RedMemSlotInfo *slots, int group_id,
     return true;
 }
 
-static bool red_get_drawable(RedMemSlotInfo *slots, int group_id,
+static bool red_get_drawable(QXLInstance *qxl, RedMemSlotInfo *slots, int group_id,
                              RedDrawable *red, QXLPHYSICAL addr, uint32_t flags)
 {
     bool ret;
 
+    red->qxl = qxl;
     if (flags & QXL_COMMAND_FLAG_COMPAT) {
-        ret = red_get_compat_drawable(slots, group_id, red, addr, flags);
+        ret = red_get_compat_drawable(qxl, slots, group_id, red, addr, flags);
     } else {
-        ret = red_get_native_drawable(slots, group_id, red, addr, flags);
+        ret = red_get_native_drawable(qxl, slots, group_id, red, addr, flags);
     }
     return ret;
 }
@@ -1487,7 +1490,9 @@ void red_drawable_unref(RedDrawable *red_drawable)
     if (--red_drawable->refs) {
         return;
     }
-    red_qxl_release_resource(red_drawable->qxl, red_drawable->release_info_ext);
+    if (red_drawable->qxl != NULL) {
+        red_qxl_release_resource(red_drawable->qxl, red_drawable->release_info_ext);
+    }
     red_put_drawable(red_drawable);
     g_free(red_drawable);
 }
@@ -1499,9 +1504,8 @@ RedDrawable *red_drawable_new(QXLInstance *qxl, RedMemSlotInfo *slots,
     RedDrawable *red = g_new0(RedDrawable, 1);
 
     red->refs = 1;
-    red->qxl = qxl;
 
-    if (!red_get_drawable(slots, group_id, red, addr, flags)) {
+    if (!red_get_drawable(qxl, slots, group_id, red, addr, flags)) {
        red_drawable_unref(red);
        return NULL;
     }
-- 
2.14.3

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