linux-kernel - [PATCH][next] drm/amd/display: fix a missing null check on a failed kzalloc

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Message-Id: <20190723142312.4013-1-colin.king@canonical.com>
Date:   Tue, 23 Jul 2019 15:23:12 +0100
From:   Colin King <colin.king@...onical.com>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amd/display: fix a missing null check on a failed kzalloc

From: Colin Ian King <colin.king@...onical.com>

Currently the allocation of config may fail and a null pointer
dereference on config can occur.  Fix this by added a null
check on a failed allocation of config.

Addresses-Coverity: ("Dereference null return")
Fixes: c2cd9d04ecf0 ("drm/amd/display: Hook up calls to do stereo mux and dig programming to stereo control interface")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 168f4a7dffdf..7cce2baec2af 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1259,6 +1259,8 @@ bool dc_set_generic_gpio_for_stereo(bool enable,
 	struct gpio_generic_mux_config *config = kzalloc(sizeof(struct gpio_generic_mux_config),
 			   GFP_KERNEL);
 
+	if (!config)
+		return false;
 	pin_info = dal_gpio_get_generic_pin_info(gpio_service, GPIO_ID_GENERIC, 0);
 
 	if (pin_info.mask == 0xFFFFFFFF || pin_info.offset == 0xFFFFFFFF) {
-- 
2.20.1