[PATCH 4.9 012/171] soc: fsl: qbman: qman: avoid allocating from non existing gen_pool

Greg Kroah-Hartman
2018-11-08T22:02:19Z

[ 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@bootlin.com>
Reviewed-by: Roy Pledge <roy.pledge@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
(cherry picked from commit f72487a2788aa70c3aee1d0ebd5470de9bac953a)
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Sasha Levin <sashal@kernel.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 2caacd9d2526..2cc82ed6433a 100644
--- a/drivers/soc/fsl/qbman/qman.c
+++ b/drivers/soc/fsl/qbman/qman.c
@@ -2713,6 +2713,9 @@ 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