linux-kernel - [PATCH 4.9 10/62] xen: dont continue xenstore initialization in case of errors

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Date:   Mon,  6 Dec 2021 15:55:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stable@...r.kernel.org, jbeulich@...e.com,
        Stefano Stabellini <stefano.stabellini@...inx.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH 4.9 10/62] xen: dont continue xenstore initialization in case of errors

From: Stefano Stabellini <stefano.stabellini@...inx.com>

commit 08f6c2b09ebd4b326dbe96d13f94fee8f9814c78 upstream.

In case of errors in xenbus_init (e.g. missing xen_store_gfn parameter),
we goto out_error but we forget to reset xen_store_domain_type to
XS_UNKNOWN. As a consequence xenbus_probe_initcall and other initcalls
will still try to initialize xenstore resulting into a crash at boot.

[    2.479830] Call trace:
[    2.482314]  xb_init_comms+0x18/0x150
[    2.486354]  xs_init+0x34/0x138
[    2.489786]  xenbus_probe+0x4c/0x70
[    2.498432]  xenbus_probe_initcall+0x2c/0x7c
[    2.503944]  do_one_initcall+0x54/0x1b8
[    2.507358]  kernel_init_freeable+0x1ac/0x210
[    2.511617]  kernel_init+0x28/0x130
[    2.516112]  ret_from_fork+0x10/0x20

Cc: <Stable@...r.kernel.org>
Cc: jbeulich@...e.com
Signed-off-by: Stefano Stabellini <stefano.stabellini@...inx.com>
Link: https://lore.kernel.org/r/20211115222719.2558207-1-sstabellini@kernel.org
Reviewed-by: Jan Beulich <jbeulich@...e.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/xen/xenbus/xenbus_probe.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -764,7 +764,7 @@ static struct notifier_block xenbus_resu
 
 static int __init xenbus_init(void)
 {
-	int err = 0;
+	int err;
 	uint64_t v = 0;
 	xen_store_domain_type = XS_UNKNOWN;
 
@@ -832,8 +832,10 @@ static int __init xenbus_init(void)
 	 */
 	proc_mkdir("xen", NULL);
 #endif
+	return 0;
 
 out_error:
+	xen_store_domain_type = XS_UNKNOWN;
 	return err;
 }