linux-kernel - [PATCH 4.20 064/111] pstore/ram: Avoid allocation and leak of platform data

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Date:   Mon, 21 Jan 2019 14:42:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yue Hu <huyue2@...ong.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH 4.20 064/111] pstore/ram: Avoid allocation and leak of platform data

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit 5631e8576a3caf606cdc375f97425a67983b420c upstream.

Yue Hu noticed that when parsing device tree the allocated platform data
was never freed. Since it's not used beyond the function scope, this
switches to using a stack variable instead.

Reported-by: Yue Hu <huyue2@...ong.com>
Fixes: 35da60941e44 ("pstore/ram: add Device Tree bindings")
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/pstore/ram.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -723,18 +723,15 @@ static int ramoops_probe(struct platform
 {
 	struct device *dev = &pdev->dev;
 	struct ramoops_platform_data *pdata = dev->platform_data;
+	struct ramoops_platform_data pdata_local;
 	struct ramoops_context *cxt = &oops_cxt;
 	size_t dump_mem_sz;
 	phys_addr_t paddr;
 	int err = -EINVAL;
 
 	if (dev_of_node(dev) && !pdata) {
-		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
-		if (!pdata) {
-			pr_err("cannot allocate platform data buffer\n");
-			err = -ENOMEM;
-			goto fail_out;
-		}
+		pdata = &pdata_local;
+		memset(pdata, 0, sizeof(*pdata));
 
 		err = ramoops_parse_dt(pdev, pdata);
 		if (err < 0)