[PATCH net] mptcp: fix bit MPTCP_PUSH_PENDING tests

The MPTCP_PUSH_PENDING define is 6 and these tests should be testing if
BIT(6) is set.

Fixes: c2e6048fa1cf ("mptcp: fix race in release_cb")
Signed-off-by: Dan Carpenter <redacted>
---
 net/mptcp/protocol.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 76958570ae7f..1590b9d4cde2 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c

@@ -2968,7 +2968,7 @@ static void mptcp_release_cb(struct sock *sk)
 	for (;;) {
 		flags = 0;
 		if (test_and_clear_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags))
-			flags |= MPTCP_PUSH_PENDING;
+			flags |= BIT(MPTCP_PUSH_PENDING);
 		if (!flags)
 			break;
 

@@ -2981,7 +2981,7 @@ static void mptcp_release_cb(struct sock *sk)
 		 */
 
 		spin_unlock_bh(&sk->sk_lock.slock);
-		if (flags & MPTCP_PUSH_PENDING)
+		if (flags & BIT(MPTCP_PUSH_PENDING))
 			__mptcp_push_pending(sk, 0);
 
 		cond_resched();

-- 
2.30.1

Hi Dan,

On 12/03/2021 08:41, Dan Carpenter wrote:

The MPTCP_PUSH_PENDING define is 6 and these tests should be testing if
BIT(6) is set.

Good catch, indeed, BIT() macro is missing!

It was not detected by our tests suite because in -net, that's the only 
flag that is set.

But another patch for net-next is coming and another flag can be set as 
well. What's funny is that this other flag is "9" which works well with 
"6" because their bits are not overlapping :)
Anyway, better with "BIT()" macro!

Reviewed-by: Matthieu Baerts <redacted>

Cheers,
Matt
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