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authorOleg Drokin <green@linuxhacker.ru>2016-02-06 02:08:08 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-09 23:26:15 +0100
commit1b6e75ee295990d866ded77c29ffc6f88b831e26 (patch)
treebe2d35660bdbc4088286561852bf059121569ad5 /drivers/acpi
parentf6cede5b49e822ebc41a099fe41ab4989f64e2cb (diff)
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ACPI / EC: Deny write access unless requested by module param
In debugfs it's not enough to just set file mode to read-only to deny write access to a file, instead just don't provide the write method unless write access is really requested. Signed-off-by: Oleg Drokin <green@linuxhacker.ru> Acked-by: Thomas Renninger <trenn@suse.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/ec_sys.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index bea8e425a8de..6c7dd7af789e 100644
--- a/drivers/acpi/ec_sys.c
+++ b/drivers/acpi/ec_sys.c
@@ -73,6 +73,9 @@ static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
loff_t init_off = *off;
int err = 0;
+ if (!write_support)
+ return -EINVAL;
+
if (*off >= EC_SPACE_SIZE)
return 0;
if (*off + count >= EC_SPACE_SIZE) {