From: Gustavo A. R. Silva Date: Thu, 20 Jan 2022 21:16:00 +0000 (-0600) Subject: ALSA: usb-audio: scarlett2: Use struct_size() helper in scarlett2_usb() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2b101256fd552bf2e29980d51394ebd88737159c;p=linux.git ALSA: usb-audio: scarlett2: Use struct_size() helper in scarlett2_usb() 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 Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20220120211600.GA28841@embeddedor Signed-off-by: Takashi Iwai --- diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index 53ebabf424722..7ff8a4817c672 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;