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spice: fix coverity reported defect in display code 

Report:

1. Condition surface, taking false branch
406    if (surface && ssd->surface &&
407        surface_width(surface) == pixman_image_get_width(ssd->surface) &&
408        surface_height(surface) == pixman_image_get_height(ssd->surface)) {
409        /* no-resize fast path: just swap backing store */
...

10. alias_transfer: Assigning: ssd->ds = surface.
440    ssd->ds = surface;

11. var_deref_op: Dereferencing null pointer ssd->ds.
CID 1264334 (#1 of 1): Dereference after null check (FORWARD_NULL)
441    ssd->surface = pixman_image_ref(ssd->ds->image);

Fix:

Move code block dereferencing ssd->ds into the already existing
if (ssd->ds) { ... } block.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2015-01-15 12:06:16 +01:00
parent fe4831b1e7
commit 51a0909914
1 changed files with 3 additions and 3 deletions
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6
ui/spice-display.c
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@ -438,9 +438,6 @@ void qemu_spice_display_switch(SimpleSpiceDisplay *ssd,
qemu_mutex_lock(&ssd->lock);
need_destroy = (ssd->ds != NULL);
ssd->ds = surface;
ssd->surface = pixman_image_ref(ssd->ds->image);
ssd->mirror = qemu_pixman_mirror_create(ssd->ds->format,
ssd->ds->image);
while ((update = QTAILQ_FIRST(&ssd->updates)) != NULL) {
QTAILQ_REMOVE(&ssd->updates, update, next);
qemu_spice_destroy_update(ssd, update);
@ -450,6 +447,9 @@ void qemu_spice_display_switch(SimpleSpiceDisplay *ssd,
qemu_spice_destroy_host_primary(ssd);
}
if (ssd->ds) {
ssd->surface = pixman_image_ref(ssd->ds->image);
ssd->mirror = qemu_pixman_mirror_create(ssd->ds->format,
ssd->ds->image);
qemu_spice_create_host_primary(ssd);
}