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: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com> --- qemu-char.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/qemu-char.c b/qemu-char.c index edc9ad6..8a424d6 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -2508,6 +2508,11 @@ CharDriverState *qemu_chr_open_opts(QemuOpts *opts, return NULL; } + if (qemu_opt_get(opts, "backend") == NULL) { + fprintf(stderr, "chardev: \"%s\" missing backend\n", + qemu_opts_id(opts)); + return NULL; + } for (i = 0; i < ARRAY_SIZE(backend_table); i++) { if (strcmp(backend_table[i].name, qemu_opt_get(opts, "backend")) == 0) break; -- 1.7.2.3