[PATCH] smbios: Fix buffer overrun when using path= option

[Daan De Meyer]

We have to make sure the array of bytes read from the path= file
is null-terminated, otherwise we run into a buffer overrun later on.

Fixes: bb99f4772f54017490e3356ecbb3df25c5d4537f ("hw/smbios: support loading 
OEM strings values from a file")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2879

Signed-off-by: Daan De Meyer <daan.j.deme...@gmail.com>
---
 hw/smbios/smbios.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 02a09eb9cd..ad4cd6721e 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -1285,6 +1285,9 @@ static int save_opt_one(void *opaque,
             g_byte_array_append(data, (guint8 *)buf, ret);
         }
 
+        buf[0] = '\0';
+        g_byte_array_append(data, (guint8 *)buf, 1);
+
         qemu_close(fd);
 
         *opt->dest = g_renew(char *, *opt->dest, (*opt->ndest) + 1);
-- 
2.49.0