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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Wenwen Wang <wenwen@cs.uga.edu>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-acpi@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 68/89] ACPI: custom_method: fix memory leaks
Date: Sun, 22 Sep 2019 14:56:56 -0400
Message-ID: <20190922185717.3412-68-sashal@kernel.org> (raw)
In-Reply-To: <20190922185717.3412-1-sashal@kernel.org>

From: Wenwen Wang <wenwen@cs.uga.edu>

[ Upstream commit 03d1571d9513369c17e6848476763ebbd10ec2cb ]

In cm_write(), 'buf' is allocated through kzalloc(). In the following
execution, if an error occurs, 'buf' is not deallocated, leading to memory
leaks. To fix this issue, free 'buf' before returning the error.

Fixes: 526b4af47f44 ("ACPI: Split out custom_method functionality into an own driver")
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/acpi/custom_method.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c
index c68e72414a67a..435bd0ffc8c02 100644
--- a/drivers/acpi/custom_method.c
+++ b/drivers/acpi/custom_method.c
@@ -48,8 +48,10 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf,
 	if ((*ppos > max_size) ||
 	    (*ppos + count > max_size) ||
 	    (*ppos + count < count) ||
-	    (count > uncopied_bytes))
+	    (count > uncopied_bytes)) {
+		kfree(buf);
 		return -EINVAL;
+	}
 
 	if (copy_from_user(buf + (*ppos), user_buf, count)) {
 		kfree(buf);
@@ -69,6 +71,7 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf,
 		add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
 	}
 
+	kfree(buf);
 	return count;
 }
 
-- 
2.20.1


  parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190922185717.3412-1-sashal@kernel.org>
2019-09-22 18:56 ` [PATCH AUTOSEL 4.14 28/89] ACPI / processor: don't print errors for processorIDs == 0xff Sasha Levin
2019-09-22 18:56 ` [PATCH AUTOSEL 4.14 61/89] ACPI / CPPC: do not require the _PSD method Sasha Levin
2019-09-22 18:56 ` Sasha Levin [this message]
2019-09-22 18:56 ` [PATCH AUTOSEL 4.14 69/89] ACPI / PCI: fix acpi_pci_irq_enable() memory leak Sasha Levin

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