diff --git a/sys/dev/drm/amd/amdgpu/amdgpu_atombios.c b/sys/dev/drm/amd/amdgpu/amdgpu_atombios.c
--- a/sys/dev/drm/amd/amdgpu/amdgpu_atombios.c
+++ b/sys/dev/drm/amd/amdgpu/amdgpu_atombios.c
@@ -103,6 +103,8 @@
 	if (amdgpu_atom_parse_data_header(ctx, index, &size, NULL, NULL, &data_offset)) {
 		i2c_info = (struct _ATOM_GPIO_I2C_INFO *)(ctx->bios + data_offset);
 
+		if (size < sizeof(ATOM_COMMON_TABLE_HEADER))
+			return i2c;
 		num_indices = (size - sizeof(ATOM_COMMON_TABLE_HEADER)) /
 			sizeof(ATOM_GPIO_I2C_ASSIGMENT);
 
@@ -174,6 +176,8 @@
 	if (amdgpu_atom_parse_data_header(ctx, index, &size, NULL, NULL, &data_offset)) {
 		gpio_info = (struct _ATOM_GPIO_PIN_LUT *)(ctx->bios + data_offset);
 
+		if (size < sizeof(ATOM_COMMON_TABLE_HEADER))
+			return gpio;
 		num_indices = (size - sizeof(ATOM_COMMON_TABLE_HEADER)) /
 			sizeof(ATOM_GPIO_PIN_ASSIGNMENT);
 
@@ -942,6 +946,8 @@
 			}
 			break;
 		case 2:
+			if (size < sizeof(ATOM_COMMON_TABLE_HEADER))
+				return false;
 			num_indices = (size - sizeof(ATOM_COMMON_TABLE_HEADER)) /
 				sizeof(ATOM_ASIC_SS_ASSIGNMENT_V2);
 			ss_assign = (union asic_ss_assignment *)((u8 *)&ss_info->info_2.asSpreadSpectrum[0]);
@@ -964,6 +970,8 @@
 			}
 			break;
 		case 3:
+			if (size < sizeof(ATOM_COMMON_TABLE_HEADER))
+				return false;
 			num_indices = (size - sizeof(ATOM_COMMON_TABLE_HEADER)) /
 				sizeof(ATOM_ASIC_SS_ASSIGNMENT_V3);
 			ss_assign = (union asic_ss_assignment *)((u8 *)&ss_info->info_3.asSpreadSpectrum[0]);