'acpi dump' without parameter results in a NULL dereference. Check the number of arguments.

Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- cmd/acpi.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/cmd/acpi.c b/cmd/acpi.c index 89970417a0..0c14409242 100644 --- a/cmd/acpi.c +++ b/cmd/acpi.c @@ -160,6 +160,9 @@ static int do_acpi_dump(struct cmd_tbl *cmdtp, int flag, int argc, char sig[ACPI_NAME_LEN]; int ret;

+ if (argc < 2) + return CMD_RET_USAGE; + name = argv[1]; if (strlen(name) != ACPI_NAME_LEN) { printf("Table name '%s' must be four characters\n", name);