From 967c0da73a7b0da186baba6632301d83644a570c Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Wed, 22 Feb 2012 22:40:00 +0000 Subject: [PATCH] vl.c: Avoid segfault when started with no arguments Fix a bug (introduced in commit a0abe47) where a command line which specified no machine arguments (either explicitly or implicitly via -kernel &co) would result in a segfault because of a NULL pointer returned from qemu_opts_find(qemu_find_opts("machine"), 0). Signed-off-by: Peter Maydell Signed-off-by: Anthony Liguori --- vl.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/vl.c b/vl.c index e1a1e89fa6..1d4c3500a9 100644 --- a/vl.c +++ b/vl.c @@ -2261,7 +2261,7 @@ int main(int argc, char **argv, char **envp) DisplayState *ds; DisplayChangeListener *dcl; int cyls, heads, secs, translation; - QemuOpts *hda_opts = NULL, *opts; + QemuOpts *hda_opts = NULL, *opts, *machine_opts; QemuOptsList *olist; int optind; const char *optarg; @@ -3320,12 +3320,15 @@ int main(int argc, char **argv, char **envp) exit(1); } - kernel_filename = qemu_opt_get(qemu_opts_find(qemu_find_opts("machine"), - 0), "kernel"); - initrd_filename = qemu_opt_get(qemu_opts_find(qemu_find_opts("machine"), - 0), "initrd"); - kernel_cmdline = qemu_opt_get(qemu_opts_find(qemu_find_opts("machine"), - 0), "append"); + machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0); + if (machine_opts) { + kernel_filename = qemu_opt_get(machine_opts, "kernel"); + initrd_filename = qemu_opt_get(machine_opts, "initrd"); + kernel_cmdline = qemu_opt_get(machine_opts, "append"); + } else { + kernel_filename = initrd_filename = kernel_cmdline = NULL; + } + if (!kernel_cmdline) { kernel_cmdline = ""; }