Commit f76fbbbb authored by Tiezhu Yang's avatar Tiezhu Yang Committed by Steven Rostedt (VMware)
Browse files

samples/kretprobes: Fix return value if register_kretprobe() failed 

Use the actual return value instead of always -1 if register_kretprobe()
failed.

E.g. without this patch:

 # insmod samples/kprobes/kretprobe_example.ko func=no_such_func
 insmod: ERROR: could not insert module samples/kprobes/kretprobe_example.ko: Operation not permitted

With this patch:

 # insmod samples/kprobes/kretprobe_example.ko func=no_such_func
 insmod: ERROR: could not insert module samples/kprobes/kretprobe_example.ko: Unknown symbol in module

Link: https://lkml.kernel.org/r/1635213091-24387-2-git-send-email-yangtiezhu@loongson.cn



Fixes: 804defea ("Kprobes: move kprobe examples to samples/")
Signed-off-by: default avatarTiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 010db091

samples/kprobes/kretprobe_example.c

+1 −1
Original line number Diff line number Diff line
@@ -86,7 +86,7 @@ static int __init kretprobe_init(void) 
	ret = register_kretprobe(&my_kretprobe);

	if (ret < 0) {

		pr_err("register_kretprobe failed, returned %d\n", ret);

		return -1;

		return ret;

	}

	pr_info("Planted return probe at %s: %p\n",

			my_kretprobe.kp.symbol_name, my_kretprobe.kp.addr);