linux-kernel - [PATCH 15/17] perf tools: Check if we read regular file in dso_

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Message-Id: <20180206181813.10943-16-jolsa@kernel.org>
Date:   Tue,  6 Feb 2018 19:18:11 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 15/17] perf tools: Check if we read regular file in dso__load

Current code in dso__load calls the is_regular_file function,
but it checks its return value only after calling symsrc__init.

That can make symsrc__init block in elf_* functions on reading
the file if the file happens to be device and not regular one.

Make the check before calling symsrc__init.

Link: http://lkml.kernel.org/n/tip-qm0sl764xzwvzgz0abqt6m46@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/symbol.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index fe15dafaef66..ea002b27b39d 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1580,9 +1580,7 @@ int dso__load(struct dso *dso, struct map *map)
 	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
 		struct symsrc *ss = &ss_[ss_pos];
 		bool next_slot = false;
-		bool is_reg;
 		bool nsexit;
-		int sirc;
 
 		enum dso_binary_type symtab_type = binary_type_symtab[i];
 
@@ -1599,18 +1597,15 @@ int dso__load(struct dso *dso, struct map *map)
 		if (nsexit)
 			nsinfo__mountns_exit(&nsc);
 
-		is_reg = is_regular_file(name);
-		sirc = symsrc__init(ss, dso, name, symtab_type);
+		if (!is_regular_file(name))
+			continue;
+
+		if (symsrc__init(ss, dso, name, symtab_type) < 0)
+			continue;
 
 		if (nsexit)
 			nsinfo__mountns_enter(dso->nsinfo, &nsc);
 
-		if (!is_reg || sirc < 0) {
-			if (sirc >= 0)
-				symsrc__destroy(ss);
-			continue;
-		}
-
 		if (!syms_ss && symsrc__has_symtab(ss)) {
 			syms_ss = ss;
 			next_slot = true;
-- 
2.13.6