linux-kernel - [PATCH AUTOSEL 4.18 022/100] soc: fsl: qbman: qman: avoid allocating from non existing gen

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Message-Id: <20181016041221.135528-22-sashal@kernel.org>
Date:   Tue, 16 Oct 2018 00:11:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Li Yang <leoyang.li@....com>, Olof Johansson <olof@...om.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 022/100] soc: fsl: qbman: qman: avoid allocating from non existing gen_pool

From: Alexandre Belloni <alexandre.belloni@...tlin.com>

[ Upstream commit 64e9e22e68512da8df3c9a7430f07621e48db3c2 ]

If the qman driver didn't probe, calling qman_alloc_fqid_range,
qman_alloc_pool_range or qman_alloc_cgrid_range (as done in dpaa_eth) will
pass a NULL pointer to gen_pool_alloc, leading to a NULL pointer
dereference.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Reviewed-by: Roy Pledge <roy.pledge@....com>
Signed-off-by: Li Yang <leoyang.li@....com>
(cherry picked from commit f72487a2788aa70c3aee1d0ebd5470de9bac953a)
Signed-off-by: Olof Johansson <olof@...om.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/fsl/qbman/qman.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/soc/fsl/qbman/qman.c b/drivers/soc/fsl/qbman/qman.c
index ecb22749df0b..8cc015183043 100644
--- a/drivers/soc/fsl/qbman/qman.c
+++ b/drivers/soc/fsl/qbman/qman.c
@@ -2729,6 +2729,9 @@ static int qman_alloc_range(struct gen_pool *p, u32 *result, u32 cnt)
 {
 	unsigned long addr;
 
+	if (!p)
+		return -ENODEV;
+
 	addr = gen_pool_alloc(p, cnt);
 	if (!addr)
 		return -ENOMEM;
-- 
2.17.1