reset: hisilicon: fix potential NULL pointer dereference
authorGustavo A. R. Silva <gustavo@embeddedor.com>
Thu, 26 Jul 2018 00:47:19 +0000 (19:47 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 21 Nov 2018 08:24:08 +0000 (09:24 +0100)
commitb3d3180689f1c433354ed01aa405ffee810df5f9
treed5a640d2cbc170f0cd150035bcfa16ee7ccdc611
parent859eac9470c8c9493b8254f05e378f8a7ccaf642
reset: hisilicon: fix potential NULL pointer dereference

commit e9a2310fb689151166df7fd9971093362d34bd79 upstream.

There is a potential execution path in which function
platform_get_resource() returns NULL. If this happens,
we will end up having a NULL pointer dereference.

Fix this by replacing devm_ioremap with devm_ioremap_resource,
which has the NULL check and the memory region request.

This code was detected with the help of Coccinelle.

Cc: stable@vger.kernel.org
Fixes: 97b7129cd2af ("reset: hisilicon: change the definition of hisi_reset_init")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/clk/hisilicon/reset.c