[qemu-xen staging] ui: fix vc_chr_write call in text_console_do_init

[patchbot@xxxxxxx]

commit 185951817dede3dfe4eb1c4c6d262607bee605ef
Author:     Gerd Hoffmann <kraxel@xxxxxxxxxx>
AuthorDate: Wed Jul 1 20:18:01 2020 +0200
Commit:     Gerd Hoffmann <kraxel@xxxxxxxxxx>
CommitDate: Mon Jul 13 11:46:35 2020 +0200

    ui: fix vc_chr_write call in text_console_do_init
    
    In case the string doesn't fit into the buffer snprintf returns the size
    it would need, so len can be larger than the buffer.  Fix this by simply
    using g_strdup_printf() instead of a static buffer.
    
    Reported-by: Wenxiang Qian <leonwxqian@xxxxxxxxx>
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
    Message-id: 20200701181801.27935-1-kraxel@xxxxxxxxxx
---
 ui/console.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/ui/console.c b/ui/console.c
index 08f75c9bf6..0579be792f 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -2184,12 +2184,12 @@ static void text_console_do_init(Chardev *chr, 
DisplayState *ds)
     text_console_resize(s);
 
     if (chr->label) {
-        char msg[128];
-        int len;
+        char *msg;
 
         s->t_attrib.bgcol = QEMU_COLOR_BLUE;
-        len = snprintf(msg, sizeof(msg), "%s console\r\n", chr->label);
-        vc_chr_write(chr, (uint8_t *)msg, len);
+        msg = g_strdup_printf("%s console\r\n", chr->label);
+        vc_chr_write(chr, (uint8_t *)msg, strlen(msg));
+        g_free(msg);
         s->t_attrib = s->t_attrib_default;
     }
 
--
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