linux-kernel - [BUGFIX PATCH] tracing/kprobes: Fix strpbrk() argument order

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Message-Id: <154108256792.2604.1816052586385217811.stgit@devbox>
Date:   Thu,  1 Nov 2018 23:29:28 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [BUGFIX PATCH] tracing/kprobes: Fix strpbrk() argument order

Fix strpbrk()'s argument order, it must pass acceptable string
in 2nd argument. Note that this can cause a kernel panic where
it recovers backup character to code->data.

Fixes: a6682814f371 ("tracing/kprobes: Allow kprobe-events to record module symbol")
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 kernel/trace/trace_probe.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 3ef15a6683c0..bd30e9398d2a 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -535,7 +535,7 @@ int traceprobe_update_arg(struct probe_arg *arg)
 			if (code[1].op != FETCH_OP_IMM)
 				return -EINVAL;
 
-			tmp = strpbrk("+-", code->data);
+			tmp = strpbrk(code->data, "+-");
 			if (tmp)
 				c = *tmp;
 			ret = traceprobe_split_symbol_offset(code->data,