linux-kernel - [PATCH 6/9] drm/msm/dsi_phy_28nm_8960: Use stack memory for temporary clock names

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220523213837.1016542-7-marijn.suijten@somainline.org>
Date:   Mon, 23 May 2022 23:38:34 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     phone-devel@...r.kernel.org, Stephen Boyd <sboyd@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rajeev Nandan <quic_rajeevny@...cinc.com>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Marek <jonathan@...ek.ca>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org
Subject: [PATCH 6/9] drm/msm/dsi_phy_28nm_8960: Use stack memory for temporary clock names

The clock names formatted into the hw_clk's init structure are only used
for the duration of the registration function where they are kstrdup'ed,
making it unnecessary to keep the allocations alive for the duration of
the device (through devm).

Just like the other DSI PHY PLL clock trees, use a stack-local char
array and save on memory outside of the pll_28nm_register function.

Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
index 943a7e847c90..554978fc434d 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c
@@ -383,7 +383,7 @@ static int dsi_28nm_pll_restore_state(struct msm_dsi_phy *phy)
 
 static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **provided_clocks)
 {
-	char *clk_name, *vco_name;
+	char clk_name[32], vco_name[32];
 	struct clk_init_data vco_init = {
 		.parent_data = &(const struct clk_parent_data) {
 			.fw_name = "ref",
@@ -404,14 +404,6 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **prov
 	if (!bytediv)
 		return -ENOMEM;
 
-	vco_name = devm_kzalloc(dev, 32, GFP_KERNEL);
-	if (!vco_name)
-		return -ENOMEM;
-
-	clk_name = devm_kzalloc(dev, 32, GFP_KERNEL);
-	if (!clk_name)
-		return -ENOMEM;
-
 	snprintf(vco_name, 32, "dsi%dvco_clk", pll_28nm->phy->id);
 	vco_init.name = vco_name;
 
-- 
2.36.1