linux-kernel - [PATCH 5.4 291/340] arm64: kexec_file: fix memory leakage in create_dtb() when fdt_open

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Message-Id: <20210301161102.613910343@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:13:55 +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, qiuguorui1 <qiuguorui1@...wei.com>,
        Will Deacon <will@...nel.org>
Subject: [PATCH 5.4 291/340] arm64: kexec_file: fix memory leakage in create_dtb() when fdt_open_into() fails

From: qiuguorui1 <qiuguorui1@...wei.com>

commit 656d1d58d8e0958d372db86c24f0b2ea36f50888 upstream.

in function create_dtb(), if fdt_open_into() fails, we need to vfree
buf before return.

Fixes: 52b2a8af7436 ("arm64: kexec_file: load initrd and device-tree")
Cc: stable@...r.kernel.org # v5.0
Signed-off-by: qiuguorui1 <qiuguorui1@...wei.com>
Link: https://lore.kernel.org/r/20210218125900.6810-1-qiuguorui1@huawei.com
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/kernel/machine_kexec_file.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -150,8 +150,10 @@ static int create_dtb(struct kimage *ima
 
 		/* duplicate a device tree blob */
 		ret = fdt_open_into(initial_boot_params, buf, buf_size);
-		if (ret)
+		if (ret) {
+			vfree(buf);
 			return -EINVAL;
+		}
 
 		ret = setup_dtb(image, initrd_load_addr, initrd_len,
 				cmdline, buf);