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Add a check to avoid NULL pointer dereference during boot-time dynamic debug parameter parsing. Signed-off-by: Martin Weiss --- lib/dynamic_debug.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 18a71a9108d3..59a04057b509 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -1479,6 +1479,8 @@ static int __init dynamic_debug_init(void) * slightly noisy if verbose, but harmless. */ cmdline = kstrdup(saved_command_line, GFP_KERNEL); + if (!cmdline) + return 0; /* prevents a boot-time NULL deref */ parse_args("dyndbg params", cmdline, NULL, 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); kfree(cmdline); -- 2.54.0