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ACPI: custom_method: fix memory leaks

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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: 526b4af47f ("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>
This commit is contained in:
Wenwen Wang 2019-08-16 00:08:27 -05:00 committed by Rafael J. Wysocki
parent 5c7ed43854
commit 03d1571d95
1 changed files with 4 additions and 1 deletions
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5
drivers/acpi/custom_method.c
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@ -49,8 +49,10 @@ 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);
@ -70,6 +72,7 @@ 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;
}