All of lore.kernel.org
 help / color / mirror / Atom feed
From: haibo.chen@nxp.com
To: adrian.hunter@intel.com, ulf.hansson@linaro.org,
	linux-mmc@vger.kernel.org, jh80.chung@samsung.com,
	kgene@kernel.org, krzk@kernel.org, michal.simek@xilinx.com,
	linux-samsung-soc@vger.kernel.org
Cc: linux-imx@nxp.com, haibo.chen@nxp.com
Subject: [PATCH] mmc: host: dereference null return value
Date: Tue, 23 Jun 2020 12:06:49 +0800	[thread overview]
Message-ID: <1592885209-25839-1-git-send-email-haibo.chen@nxp.com> (raw)

From: Haibo Chen <haibo.chen@nxp.com>

of_match_node() has the opportunity to return NULL, so need to
dereference null return value.
This is reported by Coverity.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/mmc/host/dw_mmc-exynos.c   | 5 +++--
 drivers/mmc/host/dw_mmc-k3.c       | 5 +++--
 drivers/mmc/host/dw_mmc-pltfm.c    | 3 ++-
 drivers/mmc/host/sdhci-of-arasan.c | 2 ++
 4 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index 5e3d95b63676..27ab55abb03f 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -545,12 +545,13 @@ MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
 
 static int dw_mci_exynos_probe(struct platform_device *pdev)
 {
-	const struct dw_mci_drv_data *drv_data;
+	const struct dw_mci_drv_data *drv_data = NULL;
 	const struct of_device_id *match;
 	int ret;
 
 	match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
-	drv_data = match->data;
+	if (match)
+		drv_data = match->data;
 
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index 50977ff18074..e8a148c306b3 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -451,11 +451,12 @@ MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
 
 static int dw_mci_k3_probe(struct platform_device *pdev)
 {
-	const struct dw_mci_drv_data *drv_data;
+	const struct dw_mci_drv_data *drv_data = NULL;
 	const struct of_device_id *match;
 
 	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
-	drv_data = match->data;
+	if (match)
+		drv_data = match->data;
 
 	return dw_mci_pltfm_register(pdev, drv_data);
 }
diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
index 7de37f524a96..d3dcb96efd13 100644
--- a/drivers/mmc/host/dw_mmc-pltfm.c
+++ b/drivers/mmc/host/dw_mmc-pltfm.c
@@ -78,7 +78,8 @@ static int dw_mci_pltfm_probe(struct platform_device *pdev)
 
 	if (pdev->dev.of_node) {
 		match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
-		drv_data = match->data;
+		if (match)
+			drv_data = match->data;
 	}
 
 	return dw_mci_pltfm_register(pdev, drv_data);
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index fb26e743e1fd..f2090f944a0e 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -1520,6 +1520,8 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 	const struct sdhci_arasan_of_data *data;
 
 	match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node);
+	if (match == NULL)
+		return -ENOPARAM;
 	data = match->data;
 	host = sdhci_pltfm_init(pdev, data->pdata, sizeof(*sdhci_arasan));
 
-- 
2.17.1


             reply	other threads:[~2020-06-23  4:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200623041836eucas1p2792e1fe062f8dd59af0ec18b8af1c1ef@eucas1p2.samsung.com>
2020-06-23  4:06 ` haibo.chen [this message]
2020-07-01 10:33   ` [PATCH] mmc: host: dereference null return value Adrian Hunter
2020-07-01 10:57   ` Marek Szyprowski

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1592885209-25839-1-git-send-email-haibo.chen@nxp.com \
    --to=haibo.chen@nxp.com \
    --cc=adrian.hunter@intel.com \
    --cc=jh80.chung@samsung.com \
    --cc=kgene@kernel.org \
    --cc=krzk@kernel.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-mmc@vger.kernel.org \
    --cc=linux-samsung-soc@vger.kernel.org \
    --cc=michal.simek@xilinx.com \
    --cc=ulf.hansson@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.