commit 63b66a5147069bda815989732442cb07790609db
author Kautuk Consul <kconsul@linux.vnet.ibm.com> Tue Aug 29 10:12:00 2023 +1000
committer Alexey Kardashevskiy <aik@ozlabs.ru> Mon Sep 18 18:20:45 2023 +1000
tree 6bdfa18c90b2248480a05fb2fc2a1403752580a9
parent adc561044f17d21c4d164cbe07068a3851450f8f

virtio-serial: Make read and write methods report failure

The read and write methods return successfully even if the virtio device
is closed (virtiodev is 0) and it is not able to send or receive any
characters.

Make the read and write methods return 0 to indicate they did not
succeed in this case.

This also fixes an invalid stack access in the read method.

Fixes: 8174acd ("virtio-serial: Close device completely")
Signed-off-by: Kautuk Consul <kconsul@linux.vnet.ibm.com>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>