linux-kernel - [PATCH] drm/stm: ltdc: check memory returned by devm

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Message-ID: <20230531072854.142629-1-claudiu.beznea@microchip.com>
Date:   Wed, 31 May 2023 10:28:54 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <yannick.fertre@...s.st.com>, <raphael.gallais-pou@...s.st.com>,
        <philippe.cornu@...s.st.com>, <airlied@...il.com>,
        <daniel@...ll.ch>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...s.st.com>
CC:     <dri-devel@...ts.freedesktop.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH] drm/stm: ltdc: check memory returned by devm_kzalloc()

devm_kzalloc() can fail and return NULL pointer. Check its return status.
Identified with Coccinelle (kmerr.cocci script).

Fixes: 484e72d3146b ("drm/stm: ltdc: add support of ycbcr pixel formats")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---

Hi,

This has been addressed using kmerr.cocci script proposed for update
at [1].

Thank you,
Claudiu Beznea

[1] https://lore.kernel.org/all/20230530074044.1603426-1-claudiu.beznea@microchip.com/

 drivers/gpu/drm/stm/ltdc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 03c6becda795..9f3ac54d4cb3 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -1579,6 +1579,8 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
 			       ARRAY_SIZE(ltdc_drm_fmt_ycbcr_sp) +
 			       ARRAY_SIZE(ltdc_drm_fmt_ycbcr_fp)) *
 			       sizeof(*formats), GFP_KERNEL);
+	if (!formats)
+		return NULL;
 
 	for (i = 0; i < ldev->caps.pix_fmt_nb; i++) {
 		drm_fmt = ldev->caps.pix_fmt_drm[i];
-- 
2.34.1