linux-kernel - [PATCH] drm/radeon: Avoid open coded arithmetic in memory allocation

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Message-Id: <1f44de96e6a49e912111fb3b664f087328b4c2cd.1644082664.git.christophe.jaillet@wanadoo.fr>
Date:   Sat,  5 Feb 2022 18:38:01 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/radeon: Avoid open coded arithmetic in memory allocation

kmalloc_array()/kcalloc() should be used to avoid potential overflow when
a multiplication is needed to compute the size of the requested memory.

So turn a kzalloc()+explicit size computation into an equivalent kcalloc().

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/gpu/drm/radeon/radeon_atombios.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 28c4413f4dc8..7b9cc7a9f42f 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -897,13 +897,13 @@ bool radeon_get_atom_connector_info_from_supported_devices_table(struct
 	union atom_supported_devices *supported_devices;
 	int i, j, max_device;
 	struct bios_connector *bios_connectors;
-	size_t bc_size = sizeof(*bios_connectors) * ATOM_MAX_SUPPORTED_DEVICE;
 	struct radeon_router router;
 
 	router.ddc_valid = false;
 	router.cd_valid = false;
 
-	bios_connectors = kzalloc(bc_size, GFP_KERNEL);
+	bios_connectors = kcalloc(ATOM_MAX_SUPPORTED_DEVICE,
+				  sizeof(*bios_connectors), GFP_KERNEL);
 	if (!bios_connectors)
 		return false;
 
-- 
2.32.0