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virtio-gpu: fix potential divide-by-zero regression

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Commit 9462ff4695 ("virtio-gpu/win32: allocate shareable 2d
resources/images") introduces a division, which can lead to crashes when
"height" is 0.

Fixes: https://gitlab.com/qemu-project/qemu/-/issues/1744
Reviewed-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Marc-André Lureau 2023-07-04 11:16:42 +02:00
parent ed8ad9728a
commit 9c18a9234b
1 changed files with 9 additions and 7 deletions
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16
hw/display/virtio-gpu.c
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@ -303,10 +303,11 @@ static void virtio_gpu_resource_create_2d(VirtIOGPU *g,
goto end;
}
#endif
res->image = pixman_image_create_bits(pformat,
c2d.width,
c2d.height,
bits, res->hostmem / c2d.height);
res->image = pixman_image_create_bits(
pformat,
c2d.width,
c2d.height,
bits, c2d.height ? res->hostmem / c2d.height : 0);
#ifdef WIN32
if (res->image) {
pixman_image_set_destroy_function(res->image, win32_pixman_image_destroy, res->handle);
@ -1272,9 +1273,10 @@ static int virtio_gpu_load(QEMUFile *f, void *opaque, size_t size,
return -EINVAL;
}
#endif
res->image = pixman_image_create_bits(pformat,
res->width, res->height,
bits, res->hostmem / res->height);
res->image = pixman_image_create_bits(
pformat,
res->width, res->height,
bits, res->height ? res->hostmem / res->height : 0);
if (!res->image) {
g_free(res);
return -EINVAL;