59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
From 67cbc16b3e6d34cf3932f88fd32323878026d6a0 Mon Sep 17 00:00:00 2001
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From: Kautuk Consul <kconsul@linux.vnet.ibm.com>
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Date: Tue, 29 Aug 2023 10:12:00 +1000
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Subject: [PATCH 1/2] virtio-serial: Make read and write methods report failure
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 1: Fix SLOF crash when only using virtio console (without spapr-vty)
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RH-Jira: RHEL-3709
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RH-Acked-by: David Gibson (Red Hat) <dgibson@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Commit: [1/2] 7aee41dceade77a47edd794cab43672ff95896d0
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The read and write methods return successfully even if the virtio device
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is closed (virtiodev is 0) and it is not able to send or receive any
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characters.
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Make the read and write methods return 0 to indicate they did not
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succeed in this case.
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This also fixes an invalid stack access in the read method.
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Fixes: 8174acd ("virtio-serial: Close device completely")
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Signed-off-by: Kautuk Consul <kconsul@linux.vnet.ibm.com>
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Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
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(cherry picked from commit 63b66a5147069bda815989732442cb07790609db)
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Jira: https://issues.redhat.com/browse/RHEL-3709
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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board-qemu/slof/virtio-serial.fs | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/board-qemu/slof/virtio-serial.fs b/board-qemu/slof/virtio-serial.fs
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index 82868e2..41e2e04 100644
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--- a/board-qemu/slof/virtio-serial.fs
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+++ b/board-qemu/slof/virtio-serial.fs
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@@ -67,7 +67,7 @@ virtiodev virtio-serial-init drop
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;
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: write ( addr len -- actual )
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- virtiodev 0= IF nip EXIT THEN
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+ virtiodev 0= IF 2drop 0 EXIT THEN
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tuck
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0 ?DO
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dup c@ virtiodev SWAP virtio-serial-putchar
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@@ -78,7 +78,7 @@ virtiodev virtio-serial-init drop
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: read ( addr len -- actual )
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0= IF drop 0 EXIT THEN
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- virtiodev 0= IF nip EXIT THEN
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+ virtiodev 0= IF drop 0 EXIT THEN
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virtiodev virtio-serial-haschar 0= IF 0 swap c! -2 EXIT THEN
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virtiodev virtio-serial-getchar swap c! 1
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;
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--
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2.41.0
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