[PATCH v2 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 <nam...@linutronix.de>
---
 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..c23cf95c3f6d 100644
--- a/tools/testing/selftests/coredump/stackdump_test.c
+++ b/tools/testing/selftests/coredump/stackdump_test.c
@@ -138,10 +138,12 @@ TEST_F(coredump, stackdump)
        ASSERT_NE(file, NULL);
 
        /* Step 4: Make sure all stack pointer values are non-zero */
+       line = NULL;
        for (i = 0; -1 != getline(&line, &line_length, file); ++i) {
                stack = strtoull(line, NULL, 10);
                ASSERT_NE(stack, 0);
        }
+       free(line);
 
        ASSERT_EQ(i, 1 + NUM_THREAD_SPAWN);
 
-- 
2.39.5