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samples/kretprobes: Fix return value if register_kretprobe() failed
[ Upstream commitf76fbbbb50
] 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:804defea1c
("Kprobes: move kprobe examples to samples/") Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -84,7 +84,7 @@ static int __init kretprobe_init(void)
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ret = register_kretprobe(&my_kretprobe);
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if (ret < 0) {
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pr_err("register_kretprobe failed, returned %d\n", ret);
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return -1;
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return ret;
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}
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pr_info("Planted return probe at %s: %p\n",
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my_kretprobe.kp.symbol_name, my_kretprobe.kp.addr);
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