From: Wen Yang <wenyang@linux.alibaba.com>
To: Joern Engel <joern@lazybastard.org>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org,
Wen Yang <wenyang@linux.alibaba.com>,
linux-kernel@vger.kernel.org
Subject: [RESEND PATCH] mtd: phram: fix a double free issue in error path
Date: Wed, 18 Mar 2020 23:31:56 +0800 [thread overview]
Message-ID: <20200318153156.25612-1-wenyang@linux.alibaba.com> (raw)
The variable 'name' is released multiple times in the error path,
which may cause double free issues.
This problem is avoided by adding a goto label to release the mem
uniformly. And this change also makes the code a bit more cleaner.
Fixes: 4f678a58d335 ("mtd: fix memory leaks in phram_setup")
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Cc: Joern Engel <joern@lazybastard.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/mtd/devices/phram.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
index 931e5c2481b5..b50ec7ecd10c 100644
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -243,22 +243,25 @@ static int phram_setup(const char *val)
ret = parse_num64(&start, token[1]);
if (ret) {
- kfree(name);
parse_err("illegal start address\n");
+ goto error;
}
ret = parse_num64(&len, token[2]);
if (ret) {
- kfree(name);
parse_err("illegal device length\n");
+ goto error;
}
ret = register_device(name, start, len);
- if (!ret)
- pr_info("%s device: %#llx at %#llx\n", name, len, start);
- else
- kfree(name);
+ if (ret)
+ goto error;
+
+ pr_info("%s device: %#llx at %#llx\n", name, len, start);
+ return 0;
+error:
+ kfree(name);
return ret;
}
--
2.23.0
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next reply other threads:[~2020-03-18 15:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 15:31 Wen Yang [this message]
2020-03-24 22:05 ` [RESEND PATCH] mtd: phram: fix a double free issue in error path Miquel Raynal
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