platform/x86: ISST: Check for unaligned mmio address

The address should be aligned to 4 byte boundary. So send an error for unaligned address. Signed-off-by: Srinivas Pandruvada <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Hans de Goede <[email protected]>
chewitt · Dec 7, 2020 · a552f20 · a552f20
1 parent 8b105ef
commit a552f20
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c b/drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c
@@ -42,6 +42,9 @@ static long isst_if_mmio_rd_wr(u8 *cmd_ptr, int *write_only, int resume)
 	if (io_reg->reg < 0x04 || io_reg->reg > 0xD0)
 		return -EINVAL;
 
+	if (io_reg->reg % 4)
+		return -EINVAL;
+
 	if (io_reg->read_write && !capable(CAP_SYS_ADMIN))
 		return -EPERM;