[PATCH] s390/test_unwind: fix possible memleak in test_unwind()

[Wang Hai]

test_unwind() misses to call kfree(bt) in an error path.
Add the missed function call to fix it.

Fixes: 0610154650f1 ("s390/test_unwind: print verbose unwinding results")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Wang Hai <wanghai38@xxxxxxxxxx>
---
 arch/s390/lib/test_unwind.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/s390/lib/test_unwind.c b/arch/s390/lib/test_unwind.c
index 32b7a30b2485..b0b12b46bc57 100644
--- a/arch/s390/lib/test_unwind.c
+++ b/arch/s390/lib/test_unwind.c
@@ -63,6 +63,7 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
 			break;
 		if (state.reliable && !addr) {
 			pr_err("unwind state reliable but addr is 0\n");
+			kfree(bt);
 			return -EINVAL;
 		}
 		sprint_symbol(sym, addr);
-- 
2.17.1