drm/radeon: make -fstrict-flex-arrays=3 happy

The driver parses a union where the layout up through the first
array is the same, however, the array has different sizes
depending on the elements in the union.  Be explicit to
fix the UBSAN checker.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3323
Fixes: df8fc4e934c1 ("kbuild: Enable -fstrict-flex-arrays=3")
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Kees Cook <keescook@chromium.org>

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index bb1f0a3..10793a4 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -923,8 +923,12 @@ bool radeon_get_atom_connector_info_from_supported_devices_table(struct
                max_device = ATOM_MAX_SUPPORTED_DEVICE_INFO;
 
        for (i = 0; i < max_device; i++) {
-               ATOM_CONNECTOR_INFO_I2C ci =
-                   supported_devices->info.asConnInfo[i];
+               ATOM_CONNECTOR_INFO_I2C ci;
+
+               if (frev > 1)
+                       ci = supported_devices->info_2d1.asConnInfo[i];
+               else
+                       ci = supported_devices->info.asConnInfo[i];
 
                bios_connectors[i].valid = false;