git: 469a4e669d87 - stable/13 - bhyve: avoid an empty passthru config value

The branch stable/13 has been updated by manu:

URL: https://cgit.FreeBSD.org/src/commit/?id=469a4e669d87cd01c7aae1917c55f2dc9910c4b3

commit 469a4e669d87cd01c7aae1917c55f2dc9910c4b3
Author:     Corvin Köhne <CorvinK@beckhoff.com>
AuthorDate: 2022-04-01 08:20:55 +0000
Commit:     Emmanuel Vadot <manu@FreeBSD.org>
CommitDate: 2022-05-16 15:24:33 +0000

    bhyve: avoid an empty passthru config value
    
    pci_parse_legacy_config splits the options string by comma characters.
    strchr returns a pointer to the first occurence of a character. In that
    case, it's a comma. So, pci_parse_legacy_config will stop at the first
    character and creates a new config node with a name of NULL.
    
    Reviewed by:    jhb
    Differential Revision:  https://reviews.freebsd.org/D34600
    
    (cherry picked from commit 3256b7ca36e739a08f141a7ee52b9db9d995db85)
---
 usr.sbin/bhyve/pci_passthru.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/usr.sbin/bhyve/pci_passthru.c b/usr.sbin/bhyve/pci_passthru.c
index 56f049a6d312..7817274a3541 100644
--- a/usr.sbin/bhyve/pci_passthru.c
+++ b/usr.sbin/bhyve/pci_passthru.c
@@ -669,7 +669,12 @@ passthru_legacy_config(nvlist_t *nvl, const char *opts)
 	snprintf(value, sizeof(value), "%d", func);
 	set_config_value_node(nvl, "func", value);
 
-	return (pci_parse_legacy_config(nvl, strchr(opts, ',')));
+	opts = strchr(opts, ',');
+	if (opts == NULL) {
+		return (0);
+	}
+
+	return pci_parse_legacy_config(nvl, opts + 1);
 }
 
 static int