diff options
Diffstat (limited to 'drivers/acpi/custom_method.c')
| -rw-r--r-- | drivers/acpi/custom_method.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c index b2ef4c2ec955..b097ef209313 100644 --- a/drivers/acpi/custom_method.c +++ b/drivers/acpi/custom_method.c @@ -9,6 +9,7 @@ #include <linux/uaccess.h> #include <linux/debugfs.h> #include <linux/acpi.h> +#include <linux/security.h> #include "internal.h" @@ -29,6 +30,11 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf, struct acpi_table_header table; acpi_status status; + int ret; + + ret = security_locked_down(LOCKDOWN_ACPI_TABLES); + if (ret) + return ret; if (!(*ppos)) { /* parse the table header to get the table length */ @@ -49,8 +55,10 @@ 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 +78,7 @@ 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; } |