From d1471233bb07611458b701e670e5e2ba0ac12e7c Mon Sep 17 00:00:00 2001 From: Greg Kurz Date: Mon, 8 Jan 2018 11:18:22 +0100 Subject: [PATCH] 9pfs: fix error path in pdu_submit() If we receive an unsupported request id, we first decide to return -ENOTSUPP to the client, but since the request id causes is_read_only_op() to return false, we change the error to be -EROFS if the fsdev is read-only. This doesn't make sense since we don't know what the client asked for. This patch ensures that -EROFS can only be returned if the request id is supported. Signed-off-by: Greg Kurz Reviewed-by: Eric Blake --- hw/9pfs/9p.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index 76f90f2b78..558efb41de 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -3473,14 +3473,12 @@ void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || (pdu_co_handlers[pdu->id] == NULL)) { handler = v9fs_op_not_supp; + } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { + handler = v9fs_fs_ro; } else { handler = pdu_co_handlers[pdu->id]; } - if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { - handler = v9fs_fs_ro; - } - qemu_co_queue_init(&pdu->complete); co = qemu_coroutine_create(handler, pdu); qemu_coroutine_enter(co);