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[media] gspca_topro: Add a couple of missing length check in the packet parsing code 

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans de Goede 2014-02-23 19:01:58 -03:00 committed by Mauro Carvalho Chehab
parent ce4452e65d
commit e15fd24495
1 changed files with 9 additions and 1 deletions
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10
drivers/media/usb/gspca/topro.c
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@ -4631,8 +4631,16 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
}
data++;
len--;
if (len < 2) {
gspca_dev->last_packet_type = DISCARD_PACKET;
return;
}
if (*data == 0xff && data[1] == 0xd8) {
/*fixme: there may be information in the 4 high bits*/
if (len < 7) {
gspca_dev->last_packet_type = DISCARD_PACKET;
return;
}
if ((data[6] & 0x0f) != sd->quality)
set_dqt(gspca_dev, data[6] & 0x0f);
gspca_frame_add(gspca_dev, FIRST_PACKET,
@ -4672,7 +4680,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
gspca_dev->last_packet_type = DISCARD_PACKET;
break;
case 0xcc:
if (data[1] != 0xff || data[2] != 0xd8)
if (len >= 3 && (data[1] != 0xff || data[2] != 0xd8))
gspca_frame_add(gspca_dev, INTER_PACKET,
data + 1, len - 1);
else