diff options
| author | David Brownell <david-b@pacbell.net> | 2008-04-13 23:00:44 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-04-25 06:16:53 +0200 |
| commit | c6dbf554bc8a79c9caab3dbf891a33c19068f646 (patch) | |
| tree | be47ae8d24aa2564fd424fecc1ef85e6717dd06d /drivers/usb | |
| parent | USB: add documentation about callbacks (diff) | |
| download | linux-c6dbf554bc8a79c9caab3dbf891a33c19068f646.tar.xz linux-c6dbf554bc8a79c9caab3dbf891a33c19068f646.zip | |
USB: cdc-acm: signedness fix
Fix bogus assignment of "unsigned char *" to "char *": preserve
unsignedness. These values are used directly as descriptor lengths
when iterating through the buffer, so this *could* cause oddness
that potentially includes oopsing. (IMO not likely, except as
part of a malicious device...)
Fix the bogus warning in CDC ACM which highlighted this problem
(by showing a negative descriptor type). It uses the undesirable
legacy err() for something that's not even an error; switch to
use dev_dbg, and show descriptor types in hex notation to match
the convention for such codes.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index d9b408113921..6d57413ac0f5 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -804,7 +804,7 @@ static int acm_probe (struct usb_interface *intf, { struct usb_cdc_union_desc *union_header = NULL; struct usb_cdc_country_functional_desc *cfd = NULL; - char *buffer = intf->altsetting->extra; + unsigned char *buffer = intf->altsetting->extra; int buflen = intf->altsetting->extralen; struct usb_interface *control_interface; struct usb_interface *data_interface; @@ -881,9 +881,13 @@ static int acm_probe (struct usb_interface *intf, if ((call_management_function & 3) != 3) err("This device cannot do calls on its own. It is no modem."); break; - default: - err("Ignoring extra header, type %d, length %d", buffer[2], buffer[0]); + /* there are LOTS more CDC descriptors that + * could legitimately be found here. + */ + dev_dbg(&intf->dev, "Ignoring descriptor: " + "type %02x, length %d\n", + buffer[2], buffer[0]); break; } next_desc: |