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9pfs: fix error path in pdu_submit()

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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 <groug@kaod.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Greg Kurz 2018-01-08 11:18:22 +01:00
parent 7bd41d3db6
commit d1471233bb
1 changed files with 2 additions and 4 deletions
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6
hw/9pfs/9p.c
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@ -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);