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

[ Upstream commit 0ba753bc7e79e49556e81b0d09b2de1aa558553b ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 85c4bb186203c377fb35b07b6cc8c097a5d3de00..061396e7fa0f9ca17d28dc5ea57aa9029e2a84c3 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -922,8 +922,12 @@ 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;