linux-kernel - [PATCH 5.8 102/232] perf probe: Fix wrong variable warning when the probe point is not found

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Message-Id: <20200820091617.773551777@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:19:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 5.8 102/232] perf probe: Fix wrong variable warning when the probe point is not found

From: Masami Hiramatsu <mhiramat@...nel.org>

commit 11fd3eb874e73ee8069bcfd54e3c16fa7ce56fe6 upstream.

Fix a wrong "variable not found" warning when the probe point is not
found in the debuginfo.

Since the debuginfo__find_probes() can return 0 even if it does not find
given probe point in the debuginfo, fill_empty_trace_arg() can be called
with tf.ntevs == 0 and it can emit a wrong warning.  To fix this, reject
ntevs == 0 in fill_empty_trace_arg().

E.g. without this patch;

  # perf probe -x /lib64/libc-2.30.so -a "memcpy arg1=%di"
  Failed to find the location of the '%di' variable at this address.
   Perhaps it has been optimized out.
   Use -V with the --range option to show '%di' location range.
  Added new events:
    probe_libc:memcpy    (on memcpy in /usr/lib64/libc-2.30.so with arg1=%di)
    probe_libc:memcpy    (on memcpy in /usr/lib64/libc-2.30.so with arg1=%di)

  You can now use it in all perf tools, such as:

  	perf record -e probe_libc:memcpy -aR sleep 1

With this;

  # perf probe -x /lib64/libc-2.30.so -a "memcpy arg1=%di"
  Added new events:
    probe_libc:memcpy    (on memcpy in /usr/lib64/libc-2.30.so with arg1=%di)
    probe_libc:memcpy    (on memcpy in /usr/lib64/libc-2.30.so with arg1=%di)

  You can now use it in all perf tools, such as:

  	perf record -e probe_libc:memcpy -aR sleep 1

Fixes: cb4027308570 ("perf probe: Trace a magic number if variable is not found")
Reported-by: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Reviewed-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Tested-by: Andi Kleen <ak@...ux.intel.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: stable@...r.kernel.org
Link: http://lore.kernel.org/lkml/159438667364.62703.2200642186798763202.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/perf/util/probe-finder.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1408,6 +1408,9 @@ static int fill_empty_trace_arg(struct p
 	char *type;
 	int i, j, ret;
 
+	if (!ntevs)
+		return -ENOENT;
+
 	for (i = 0; i < pev->nargs; i++) {
 		type = NULL;
 		for (j = 0; j < ntevs; j++) {