[Qemu-devel] [PATCH 1/3] i386: fix regression parsing multiboot initrd modules

["Daniel P. Berrangé" <berrange@redhat.com>]

The logic for parsing the multiboot initrd modules was messed up in

  commit 950c4e6c94b15cd0d8b63891dddd7a8dbf458e6a
  Author: Daniel P. Berrangé <berrange@redhat.com>
  Date:   Mon Apr 16 12:17:43 2018 +0100

    opts: don't silently truncate long option values

Causing the length to be undercounter, and the number of modules over
counted. It also passes NULL to get_opt_value() which was not robust
at accepting a NULL value.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 hw/i386/multiboot.c | 3 +--
 util/qemu-option.c  | 4 +++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
index 7a2953e26f..8e26545814 100644
--- a/hw/i386/multiboot.c
+++ b/hw/i386/multiboot.c
@@ -292,8 +292,7 @@ int load_multiboot(FWCfgState *fw_cfg,
     cmdline_len += strlen(kernel_cmdline) + 1;
     if (initrd_filename) {
         const char *r = get_opt_value(initrd_filename, NULL);
-        cmdline_len += strlen(r) + 1;
-        mbs.mb_mods_avail = 1;
+        cmdline_len += strlen(initrd_filename) + 1;
         while (1) {
             mbs.mb_mods_avail++;
             r = get_opt_value(r, NULL);
diff --git a/util/qemu-option.c b/util/qemu-option.c
index 58d1c23893..8a68bc2314 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -75,7 +75,9 @@ const char *get_opt_value(const char *p, char **value)
     size_t capacity = 0, length;
     const char *offset;
 
-    *value = NULL;
+    if (value) {
+        *value = NULL;
+    }
     while (1) {
         offset = strchr(p, ',');
         if (!offset) {
-- 
2.17.0