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

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[ Upstream commit f76fbbbb5061fe14824ba5807c44bd7400a6b4e1 ]

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>
This commit is contained in:
Tiezhu Yang 2021-10-26 09:51:28 +08:00 committed by Greg Kroah-Hartman
parent 9435b2f9c0
commit 3f3b4054e2
1 changed files with 1 additions and 1 deletions
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2
samples/kprobes/kretprobe_example.c
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@ -84,7 +84,7 @@ static int __init kretprobe_init(void)
ret = register_kretprobe(&my_kretprobe); ret = register_kretprobe(&my_kretprobe);
if (ret < 0) { if (ret < 0) {
pr_err("register_kretprobe failed, returned %d\n", ret); pr_err("register_kretprobe failed, returned %d\n", ret);
return -1; return ret;
} }
pr_info("Planted return probe at %s: %p\n", pr_info("Planted return probe at %s: %p\n",
my_kretprobe.kp.symbol_name, my_kretprobe.kp.addr); my_kretprobe.kp.symbol_name, my_kretprobe.kp.addr);