linux-kernel - [PATCH RESEND v1] locking/ww_mutex: Prevent read of uninitialized memory

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Message-Id: <20170314194402.15834-1-robert.foss@collabora.com>
Date:   Tue, 14 Mar 2017 15:44:02 -0400
From:   Robert Foss <robert.foss@...labora.com>
To:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Cc:     Robert Foss <robert.foss@...labora.com>
Subject: [PATCH RESEND v1] locking/ww_mutex: Prevent read of uninitialized memory

On "missed ABBA deadlock" abba.result is read, but not initialized
in all situations.

Detected by CoverityScan, CID#1402035 ("Uninitialized scalar variable")

Signed-off-by: Robert Foss <robert.foss@...labora.com>
---
 kernel/locking/test-ww_mutex.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index 6b7abb334ca6..beb76693ccfa 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -196,7 +196,7 @@ static void test_abba_work(struct work_struct *work)
 
 static int test_abba(bool resolve)
 {
-	struct test_abba abba;
+	struct test_abba abba = { 0 };
 	struct ww_acquire_ctx ctx;
 	int err, ret;
 
-- 
2.11.0.453.g787f75f05