[PATCH 1/3] selftests: coredump: Properly initialize pointer

[Nam Cao]

The buffer pointer "line" is not initialized. This pointer is passed to
getline().

It can still work if the stack is zero-initialized, because getline() can
work with a NULL pointer as buffer.

But this is obviously broken. This bug shows up while running the test on a
riscv64 machine.

Fix it by properly initializing the pointer.

Fixes: 15858da53542 ("selftests: coredump: Add stackdump test")
Signed-off-by: Nam Cao <namcao@xxxxxxxxxxxxx>
---
 tools/testing/selftests/coredump/stackdump_test.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/coredump/stackdump_test.c b/tools/testing/selftests/coredump/stackdump_test.c
index 137b2364a082..1dc54e128586 100644
--- a/tools/testing/selftests/coredump/stackdump_test.c
+++ b/tools/testing/selftests/coredump/stackdump_test.c
@@ -100,6 +100,8 @@ TEST_F(coredump, stackdump)
 	FILE *file;
 	pid_t pid;
 
+	line = NULL;
+
 	/*
 	 * Step 1: Setup core_pattern so that the stackdump script is executed when the child
 	 * process crashes
-- 
2.39.5