[LTP] [PATCH] futex_waitv03: fix SIGSEGV in TCONF cleanup

[Chunyu Hu]

When futex_time64 is not supported, TCONF will do the test cleanup
and test quit, in this case, the waitv array and shms are not allocated,
we can get a segment fault if accessing the waitv[*]. Add the flag
to record if the memory allocation is done, so the cleanup can do
correctly in TCONF case.

We can hit the issue on ppc64le:

tst_test.c:1456: TINFO: Timeout per run is 0h 05m 00s
futex_waitv03.c:36: TINFO: Testing variant: syscall with old kernel spec
tst_buffers.c:55: TINFO: Test is using guarded buffers
futex_waitv03.c:108: TPASS: futex_waitv returned correctly
tst_test.c:1456: TINFO: Timeout per run is 0h 05m 00s
futex_waitv03.c:36: TINFO: Testing variant: syscall time64 with kernel spec
../../../../include/tst_timer.h:271: TCONF: syscall(422) __NR_futex_time64 not supported on your arch
tst_test.c:1512: TBROK: Test killed by SIGSEGV!

Signed-off-by: Chunyu Hu <chuhu@redhat.com>
---
 testcases/kernel/syscalls/futex/futex_waitv03.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/testcases/kernel/syscalls/futex/futex_waitv03.c b/testcases/kernel/syscalls/futex/futex_waitv03.c
index 1f53addac..ffe5c66cd 100644
--- a/testcases/kernel/syscalls/futex/futex_waitv03.c
+++ b/testcases/kernel/syscalls/futex/futex_waitv03.c
@@ -26,6 +26,7 @@ static char *str_numfutex;
 static int numfutex = 30;
 
 static struct futex_waitv *waitv;
+static unsigned int waitv_allocated;
 static int *shmids;
 
 static void setup(void)
@@ -50,12 +51,16 @@ static void setup(void)
 		waitv[i].flags = FUTEX_32;
 		waitv[i].val = 0;
 	}
+	waitv_allocated = tst_variant + 1;
 }
 
 static void cleanup(void)
 {
 	int i;
 
+	if (waitv_allocated != (tst_variant + 1))
+		return;
+
 	for (i = 0; i < numfutex; i++) {
 		if (!waitv[i].uaddr)
 			continue;
-- 
2.35.1