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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>
This commit is contained in:
Julia Lawall 2011-12-23 14:02:55 +01:00 committed by Greg Kroah-Hartman
parent 5632c827cb
commit e7c8e8605d
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/class/cdc-acm.c
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@ -1230,6 +1230,8 @@ static int acm_probe(struct usb_interface *intf,
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 @@ static int acm_probe(struct usb_interface *intf,
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;
}
}