[PATCH v3] virtio-dmabuf: Ensure UUID persistence for hash table insertion

[PATCH v3] virtio-dmabuf: Ensure UUID persistence for hash table insertion

[Dorinda Bassey]

In `virtio_add_resource` function, the UUID used as a key for
`g_hash_table_insert` was temporary, which could lead to
invalid lookups when accessed later. This patch ensures that
the UUID remains valid by duplicating it into a newly allocated
memory space. The value is then inserted into the hash table
with this persistent UUID key to ensure that the key stored in
the hash table remains valid as long as the hash table entry
exists.

Fixes: faefdba847 ("hw/display: introduce virtio-dmabuf")
Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Albert Esteve <aesteve@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
v3: removed blank line between trailers

 hw/display/virtio-dmabuf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/display/virtio-dmabuf.c b/hw/display/virtio-dmabuf.c
index 3dba4577ca..5e0395be77 100644
--- a/hw/display/virtio-dmabuf.c
+++ b/hw/display/virtio-dmabuf.c
@@ -35,11 +35,13 @@ static bool virtio_add_resource(QemuUUID *uuid, VirtioSharedObject *value)
     if (resource_uuids == NULL) {
         resource_uuids = g_hash_table_new_full(qemu_uuid_hash,
                                                uuid_equal_func,
-                                               NULL,
+                                               g_free,
                                                g_free);
     }
     if (g_hash_table_lookup(resource_uuids, uuid) == NULL) {
-        g_hash_table_insert(resource_uuids, uuid, value);
+        g_hash_table_insert(resource_uuids,
+                            g_memdup2(uuid, sizeof(*uuid)),
+                            value);
     } else {
         result = false;
     }
-- 
2.51.0

Re: [PATCH v3] virtio-dmabuf: Ensure UUID persistence for hash table insertion

[Jim MacArthur]

On Thu, 4 Dec 2025 at 16:22, Dorinda Bassey <dbassey@redhat.com> wrote:
>
> In `virtio_add_resource` function, the UUID used as a key for
> `g_hash_table_insert` was temporary, which could lead to
> invalid lookups when accessed later. This patch ensures that
> the UUID remains valid by duplicating it into a newly allocated
> memory space. The value is then inserted into the hash table
> with this persistent UUID key to ensure that the key stored in
> the hash table remains valid as long as the hash table entry
> exists.
>
> Fixes: faefdba847 ("hw/display: introduce virtio-dmabuf")
> Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
> Reviewed-by: Albert Esteve <aesteve@redhat.com>
> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
> v3: removed blank line between trailers
>
>  hw/display/virtio-dmabuf.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>

Reviewed-by: Jim MacArthur <jim.macarthur@linaro.org>