kselftest/arm64: Fix size of thread_data values for pthread_join()

pthread_join() stores the thread's return value (a "void *", i.e. 8 bytes on 64 bit computers) into the address that is passed as second parameter. However, the entries of thread_data are only normal "int"s, i.e. only 4 bytes. The additional 4 bytes of the return value clobber whatever is adjacent on the stack, i.e. other members of the thread_data array (which will be re-written in the next iteration of the for-loop, so that nobody noticed this problem), or another other local variable on the stack for the last iteration. Use "intptr_t" to declare the thread_data array entries with the correct size.

---
 tools/testing/selftests/arm64/mte/check_gcr_el1_cswitch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index d23f154d3288c..5d9dc8bcfbf55 100644
@@ -69,7 +69,7 @@ void *execute_thread(void *x)
 int execute_test(pid_t pid)
 {
 	pthread_t thread_id[MAX_THREADS];
-	int thread_data[MAX_THREADS];
+	intptr_t thread_data[MAX_THREADS];
 
 	for (int i = 0; i < MAX_THREADS; i++)
 		pthread_create(&thread_id[i], NULL,

2.55.0

Applied to arm64 (for-next/fixes), thanks!

[1/1] kselftest/arm64: Fix size of thread_data values for pthread_join()

      https://git.kernel.org/arm64/c/3d1ba5cbfb62

Cheers,

Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev