[LTP] [PATCH] msgstress04: make sure not pass IPC_PRIVATE to msgget

[kai.kang@windriver.com]

From: Kai Kang <kai.kang@windriver.com>

It fails to run case msgstress04:

$ ./msgstress04 -n 1 -c 1 -l 1

It only inits the first MSGMNI members of keyarray. So if argument off
of function dotest_iteration is greater than MSGMNI, the argument key
passed to function dotest() will be IPC_PRIVATE(0) which will finally
pass to syscall msgget(), then cause case fails.

Make sure get the value for key from the initialized members of keyarray.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
 testcases/kernel/syscalls/ipc/msgstress/msgstress04.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/ipc/msgstress/msgstress04.c b/testcases/kernel/syscalls/ipc/msgstress/msgstress04.c
index 18fad4fbd..a357ce59a 100644
--- a/testcases/kernel/syscalls/ipc/msgstress/msgstress04.c
+++ b/testcases/kernel/syscalls/ipc/msgstress/msgstress04.c
@@ -198,7 +198,7 @@ static void dotest_iteration(int off)
 	memset(pidarray, 0, sizeof(pidarray));
 
 	for (i = 0; i < nprocs; i++) {
-		key = keyarray[off + i];
+		key = keyarray[(off + i) % MSGMNI];
 
 		if ((pid = FORK_OR_VFORK()) < 0)
 			tst_brkm(TFAIL, cleanup,
-- 
2.17.0