[18/28] hw/vfio/pci: Replace g_memdup() by g_memdup2_qemu()

Commit Message

Philippe Mathieu-Daudé Sept. 3, 2021, 11:06 a.m. UTC

Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538

  The old API took the size of the memory to duplicate as a guint,
  whereas most memory functions take memory sizes as a gsize. This
  made it easy to accidentally pass a gsize to g_memdup(). For large
  values, that would lead to a silent truncation of the size from 64
  to 32 bits, and result in a heap area being returned which is
  significantly smaller than what the caller expects. This can likely
  be exploited in various modules to cause a heap buffer overflow.

Replace g_memdup() by the safer g_memdup2_qemu() wrapper.

Signed-off-by: Philippe Mathieu-Daudé <[e-mail]>
---
 hw/vfio/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index e1ea1d8a23b..5c9acfd9c40 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2040,7 +2040,7 @@  static void vfio_add_ext_cap(VFIOPCIDevice *vdev)
      * physical device, we cache the config space to avoid overwriting
      * the original config space when we parse the extended capabilities.
      */
-    config = g_memdup(pdev->config, vdev->config_size);
+    config = g_memdup2_qemu(pdev->config, vdev->config_size);
 
     /*
      * Extended capabilities are chained with each pointing to the next, so we