diff options
Diffstat (limited to 'hw/usb/dev-mtp.c')
| -rw-r--r-- | hw/usb/dev-mtp.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index ebf210fbf8..99548b012d 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -1699,12 +1699,19 @@ static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen) MTPObject *o; MTPObject *p = usb_mtp_object_lookup(s, s->dataset.parent_handle); uint32_t next_handle = s->next_handle; + size_t filename_chars = dlen - offsetof(ObjectInfo, filename); + + /* + * filename is utf-16. We're intentionally doing + * integer division to truncate if malicious guest + * sent an odd number of bytes. + */ + filename_chars /= 2; assert(!s->write_pending); assert(p != NULL); - filename = utf16_to_str(MIN(dataset->length, - dlen - offsetof(ObjectInfo, filename)), + filename = utf16_to_str(MIN(dataset->length, filename_chars), dataset->filename); if (strchr(filename, '/')) { |