Commit e4467fb6 authored by Wenwen Wang's avatar Wenwen Wang Committed by Greg Kroah-Hartman

ACPI: custom_method: fix memory leaks

[ Upstream commit 03d1571d ]

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: 526b4af4 ("ACPI: Split out custom_method functionality into an own driver")
Signed-off-by: default avatarWenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 6fceb241
......@@ -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;
}
......
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