linux-kernel - [PATCH 4.14 193/246] staging: vchiq_core: Fix missing semaphore release in error case

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Message-Id: <20180801165020.958876027@linuxfoundation.org>
Date:   Wed,  1 Aug 2018 18:51:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 193/246] staging: vchiq_core: Fix missing semaphore release in error case

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Wahren <stefan.wahren@...e.com>

[ Upstream commit 8113b89fc615cfb531df0334fb3a091cf6a45ce0 ]

The bail out branch in case of a invalid tx_pos missed a semaphore
release. Dan Carpenter found this with a static checker.

Fixes: d1eab9dec610 ("staging: vchiq_core: Bail out in case of invalid tx_pos")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -601,6 +601,7 @@ reserve_space(VCHIQ_STATE_T *state, size
 		}
 
 		if (tx_pos == (state->slot_queue_available * VCHIQ_SLOT_SIZE)) {
+			up(&state->slot_available_event);
 			pr_warn("%s: invalid tx_pos: %d\n", __func__, tx_pos);
 			return NULL;
 		}