linux-kernel - Re: [patch] perf report segfault with 0-sized strings

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Date:   Thu, 25 Jul 2019 15:04:32 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     linux-kernel@...r.kernel.org
cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [patch] perf report segfault with 0-sized strings


probably all perf_header_strings are affected by this.  The fuzzer just 
tripped up cmdline now, which needs this fix.

Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c24db7f4909c..631aa1911f3a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1427,6 +1430,8 @@ static void print_cmdline(struct feat_fd *ff, FILE *fp)
 
 	fprintf(fp, "# cmdline : ");
 
+	if (ff->ph->env.cmdline_argv==NULL) return;
+
 	for (i = 0; i < nr; i++) {
 		char *argv_i = strdup(ff->ph->env.cmdline_argv[i]);
 		if (!argv_i) {