lib/ubsan.c: fix gcc-10 warnings

The latest compiler expects slightly different function prototypes
for the ubsan helpers:

  lib/ubsan.c:192:6: error: conflicting types for built-in function '__ubsan_handle_add_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
    192 | void __ubsan_handle_add_overflow(struct overflow_data *data,
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  lib/ubsan.c:200:6: error: conflicting types for built-in function '__ubsan_handle_sub_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
    200 | void __ubsan_handle_sub_overflow(struct overflow_data *data,
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  lib/ubsan.c:207:6: error: conflicting types for built-in function '__ubsan_handle_mul_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
    207 | void __ubsan_handle_mul_overflow(struct overflow_data *data,
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  lib/ubsan.c:214:6: error: conflicting types for built-in function '__ubsan_handle_negate_overflow'; expected 'void(void *, void *)' [-Werror=builtin-declaration-mismatch]
    214 | void __ubsan_handle_negate_overflow(struct overflow_data *data,
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  lib/ubsan.c:234:6: error: conflicting types for built-in function '__ubsan_handle_divrem_overflow'; expected 'void(void *, void *, void *)' [-Werror=builtin-declaration-mismatch]
    234 | void __ubsan_handle_divrem_overflow(struct overflow_data *data,
        |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Change the Linux implementation to match these, using a local typed
pointer.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Julien Grall <julien.grall@arm.com>
Link: http://lkml.kernel.org/r/20200429185948.4189600-1-arnd@arndb.deSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/ubsan.c

@@ -189,7 +189,7 @@ static void handle_overflow(struct overflow_data *data, void *lhs,
 	ubsan_epilogue();
 }
 
-void __ubsan_handle_add_overflow(struct overflow_data *data,
+void __ubsan_handle_add_overflow(void *data,
 				void *lhs, void *rhs)
 {
 
@@ -197,23 +197,23 @@ void __ubsan_handle_add_overflow(struct overflow_data *data,
 }
 EXPORT_SYMBOL(__ubsan_handle_add_overflow);
 
-void __ubsan_handle_sub_overflow(struct overflow_data *data,
+void __ubsan_handle_sub_overflow(void *data,
 				void *lhs, void *rhs)
 {
 	handle_overflow(data, lhs, rhs, '-');
 }
 EXPORT_SYMBOL(__ubsan_handle_sub_overflow);
 
-void __ubsan_handle_mul_overflow(struct overflow_data *data,
+void __ubsan_handle_mul_overflow(void *data,
 				void *lhs, void *rhs)
 {
 	handle_overflow(data, lhs, rhs, '*');
 }
 EXPORT_SYMBOL(__ubsan_handle_mul_overflow);
 
-void __ubsan_handle_negate_overflow(struct overflow_data *data,
-				void *old_val)
+void __ubsan_handle_negate_overflow(void *_data, void *old_val)
 {
+	struct overflow_data *data = _data;
 	char old_val_str[VALUE_LENGTH];
 
 	if (suppress_report(&data->location))
@@ -231,9 +231,9 @@ void __ubsan_handle_negate_overflow(struct overflow_data *data,
 EXPORT_SYMBOL(__ubsan_handle_negate_overflow);
 
 
-void __ubsan_handle_divrem_overflow(struct overflow_data *data,
-				void *lhs, void *rhs)
+void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
 {
+	struct overflow_data *data = _data;
 	char rhs_val_str[VALUE_LENGTH];
 
 	if (suppress_report(&data->location))
@@ -326,10 +326,9 @@ void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
 }
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch);
 
-void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
-				void *ptr)
+void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr)
 {
-
+	struct type_mismatch_data_v1 *data = _data;
 	struct type_mismatch_data_common common_data = {
 		.location = &data->location,
 		.type = data->type,
@@ -341,8 +340,9 @@ void __ubsan_handle_type_mismatch_v1(struct type_mismatch_data_v1 *data,
 }
 EXPORT_SYMBOL(__ubsan_handle_type_mismatch_v1);
 
-void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
+void __ubsan_handle_out_of_bounds(void *_data, void *index)
 {
+	struct out_of_bounds_data *data = _data;
 	char index_str[VALUE_LENGTH];
 
 	if (suppress_report(&data->location))
@@ -357,9 +357,9 @@ void __ubsan_handle_out_of_bounds(struct out_of_bounds_data *data, void *index)
 }
 EXPORT_SYMBOL(__ubsan_handle_out_of_bounds);
 
-void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
-					void *lhs, void *rhs)
+void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
 {
+	struct shift_out_of_bounds_data *data = _data;
 	struct type_descriptor *rhs_type = data->rhs_type;
 	struct type_descriptor *lhs_type = data->lhs_type;
 	char rhs_str[VALUE_LENGTH];
@@ -399,8 +399,9 @@ void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
 EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
 
 
-void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
+void __ubsan_handle_builtin_unreachable(void *_data)
 {
+	struct unreachable_data *data = _data;
 	ubsan_prologue(&data->location, "unreachable");
 	pr_err("calling __builtin_unreachable()\n");
 	ubsan_epilogue();
@@ -408,9 +409,9 @@ void __ubsan_handle_builtin_unreachable(struct unreachable_data *data)
 }
 EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
 
-void __ubsan_handle_load_invalid_value(struct invalid_value_data *data,
-				void *val)
+void __ubsan_handle_load_invalid_value(void *_data, void *val)
 {
+	struct invalid_value_data *data = _data;
 	char val_str[VALUE_LENGTH];
 
 	if (suppress_report(&data->location))