drivers/usb/class/cdc-acm.c: clear dangling pointer

On some failures, the country_code field of an acm structure is freed
without freeing the acm structure itself.  Elsewhere, operations including
memcpy and kfree are performed on the country_code field.  The patch sets
the country_code field to NULL when it is freed, and likewise sets the
country_code_size field to 0.

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Oliver Neukum <oneukum@suse.de>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index d9d9340abe60..57f2e1032086 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1230,6 +1230,8 @@ made_compressed_probe:
                 i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
                 if (i < 0) {
                         kfree(acm->country_codes);
+                        acm->country_codes = NULL;
+                        acm->country_code_size = 0;
                         goto skip_countries;
                 }
 
@@ -1238,6 +1240,8 @@ made_compressed_probe:
                 if (i < 0) {
                         device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
                         kfree(acm->country_codes);
+                        acm->country_codes = NULL;
+                        acm->country_code_size = 0;
                         goto skip_countries;
                 }
         }