On Thu, Jan 20, 2022 at 03:16:00PM -0600, Gustavo A. R. Silva wrote: > Make use of the struct_size() helper instead of an open-coded version, > in order to avoid any potential type mistakes or integer overflows that, > in the worst scenario, could lead to heap overflows. > > Also, address the following sparse warnings: > sound/usb/mixer_scarlett_gen2.c:1064:28: warning: using sizeof on a flexible structure > sound/usb/mixer_scarlett_gen2.c:1065:29: warning: using sizeof on a flexible structure > > Link: https://github.com/KSPP/linux/issues/174 > Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> Looks good to me! Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> > --- > Changes in v2: > - Use correct format specifier %zu for type size_t argument. > > sound/usb/mixer_scarlett_gen2.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c > index 53ebabf42472..7ff8a4817c67 100644 > --- a/sound/usb/mixer_scarlett_gen2.c > +++ b/sound/usb/mixer_scarlett_gen2.c > @@ -1061,9 +1061,9 @@ static int scarlett2_usb( > { > struct scarlett2_data *private = mixer->private_data; > struct usb_device *dev = mixer->chip->dev; > - u16 req_buf_size = sizeof(struct scarlett2_usb_packet) + req_size; > - u16 resp_buf_size = sizeof(struct scarlett2_usb_packet) + resp_size; > struct scarlett2_usb_packet *req, *resp = NULL; > + size_t req_buf_size = struct_size(req, data, req_size); > + size_t resp_buf_size = struct_size(resp, data, resp_size); > int err; > > req = kmalloc(req_buf_size, GFP_KERNEL); > @@ -1111,7 +1111,7 @@ static int scarlett2_usb( > usb_audio_err( > mixer->chip, > "Scarlett Gen 2/3 USB response result cmd %x was %d " > - "expected %d\n", > + "expected %zu\n", > cmd, err, resp_buf_size); > err = -EINVAL; > goto unlock; > -- > 2.27.0 > -- Kees Cook
