thunderbolt: xdomain: Avoid potential stack OOB read

tb_xdp_properties_changed_request() was calling tb_xdp_handle_error() with
a struct tb_xdp_properties_changed_response on the stack, which does not
have the "error" field present when cast to struct tb_xdp_error_response.
This was detected when building with -Warray-bounds:

drivers/thunderbolt/xdomain.c: In function 'tb_xdomain_properties_changed':
drivers/thunderbolt/xdomain.c:226:22: error: array subscript 'const struct tb_xdp_error_response[0]' is partly outside array bounds of 'struct tb_xdp_properties_changed_response[1]' [-Werror=array-bounds]
  226 |         switch (error->error) {
      |                 ~~~~~^~~~~~~
drivers/thunderbolt/xdomain.c:448:51: note: while referencing 'res'
  448 |         struct tb_xdp_properties_changed_response res;
      |                                                   ^~~

Add union containing struct tb_xdp_error_response to structures passed
to tb_xdp_handle_error(), so that the "error" field will be present.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

1 files changed, 30 insertions, 17 deletions

diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h
index bcabfcb2fd03..fe1afa44c56d 100644
--- a/drivers/thunderbolt/tb_msgs.h
+++ b/drivers/thunderbolt/tb_msgs.h
@@ -535,15 +535,25 @@ struct tb_xdp_header {
 	u32 type;
 };
 
+struct tb_xdp_error_response {
+	struct tb_xdp_header hdr;
+	u32 error;
+};
+
 struct tb_xdp_uuid {
 	struct tb_xdp_header hdr;
 };
 
 struct tb_xdp_uuid_response {
-	struct tb_xdp_header hdr;
-	uuid_t src_uuid;
-	u32 src_route_hi;
-	u32 src_route_lo;
+	union {
+		struct tb_xdp_error_response err;
+		struct {
+			struct tb_xdp_header hdr;
+			uuid_t src_uuid;
+			u32 src_route_hi;
+			u32 src_route_lo;
+		};
+	};
 };
 
 struct tb_xdp_properties {
@@ -555,13 +565,18 @@ struct tb_xdp_properties {
 };
 
 struct tb_xdp_properties_response {
-	struct tb_xdp_header hdr;
-	uuid_t src_uuid;
-	uuid_t dst_uuid;
-	u16 offset;
-	u16 data_length;
-	u32 generation;
-	u32 data[0];
+	union {
+		struct tb_xdp_error_response err;
+		struct {
+			struct tb_xdp_header hdr;
+			uuid_t src_uuid;
+			uuid_t dst_uuid;
+			u16 offset;
+			u16 data_length;
+			u32 generation;
+			u32 data[];
+		};
+	};
 };
 
 /*
@@ -580,7 +595,10 @@ struct tb_xdp_properties_changed {
 };
 
 struct tb_xdp_properties_changed_response {
-	struct tb_xdp_header hdr;
+	union {
+		struct tb_xdp_error_response err;
+		struct tb_xdp_header hdr;
+	};
 };
 
 enum tb_xdp_error {
@@ -591,9 +609,4 @@ enum tb_xdp_error {
 	ERROR_NOT_READY,
 };
 
-struct tb_xdp_error_response {
-	struct tb_xdp_header hdr;
-	u32 error;
-};
-
 #endif