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usb-ccid: better bulk_out error handling 

Add err goto label where we can jump to from all error conditions.
STALL request on all errors.  Reset position on all errors.

Normal request processing is not in a else branch any more, so this code
is reintended, there are no code changes in that part of the code
though.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 1487250819-23764-2-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-02-16 14:13:37 +01:00
parent 558ff1b6ef
commit 0aeebc73b7
1 changed files with 61 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
hw/usb/dev-smartcard-reader.c
View File

@ -1001,8 +1001,7 @@ static void ccid_handle_bulk_out(USBCCIDState *s, USBPacket *p)
CCID_Header *ccid_header;
if (p->iov.size + s->bulk_out_pos > BULK_OUT_DATA_SIZE) {
p->status = USB_RET_STALL;
return;
goto err;
}
ccid_header = (CCID_Header *)s->bulk_out_data;
usb_packet_copy(p, s->bulk_out_data + s->bulk_out_pos, p->iov.size);
@ -1017,7 +1016,9 @@ static void ccid_handle_bulk_out(USBCCIDState *s, USBPacket *p)
DPRINTF(s, 1,
"%s: bad USB_TOKEN_OUT length, should be at least 10 bytes\n",
__func__);
} else {
goto err;
}
DPRINTF(s, D_MORE_INFO, "%s %x %s\n", __func__,
ccid_header->bMessageType,
ccid_message_type_to_str(ccid_header->bMessageType));
@ -1073,8 +1074,13 @@ static void ccid_handle_bulk_out(USBCCIDState *s, USBPacket *p)
ccid_write_slot_status(s, ccid_header);
break;
}
}
s->bulk_out_pos = 0;
return;
err:
p->status = USB_RET_STALL;
s->bulk_out_pos = 0;
return;
}
static void ccid_bulk_in_copy_to_guest(USBCCIDState *s, USBPacket *p)