Commit 1bbd185f authored by Stefan Hajnoczi's avatar Stefan Hajnoczi Committed by Aurelien Jarno
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qemu-char: Check for missing backend name

Check if the backend option is missing before searching the backend
table.  This fixes a NULL pointer dereference when QEMU is invoked with
the following invalid command-line:

  $ qemu -chardev id=foo,path=/tmp/socket

Previously QEMU would segfault, now it produces this error message:

  chardev: "foo" missing backend
Signed-off-by: default avatarStefan Hajnoczi <>
Signed-off-by: default avatarAurelien Jarno <>
parent 9f953ca0
......@@ -2506,6 +2506,11 @@ CharDriverState *qemu_chr_open_opts(QemuOpts *opts,
return NULL;
if (qemu_opt_get(opts, "backend") == NULL) {
fprintf(stderr, "chardev: \"%s\" missing backend\n",
return NULL;
for (i = 0; i < ARRAY_SIZE(backend_table); i++) {
if (strcmp(backend_table[i].name, qemu_opt_get(opts, "backend")) == 0)
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