linux-kernel - [tip:perf/urgent] perf symbols: Fix crash in elf_section_by

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Message-ID: <tip-155b3a13a65d4217316dbe094843f2a7df0711fa@git.kernel.org>
Date:	Tue, 11 Mar 2014 03:16:46 -0700
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	hpa@...or.com, mingo@...nel.org, a.p.zijlstra@...llo.nl,
	namhyung@...nel.org, jolsa@...hat.com, fweisbec@...il.com,
	dsahern@...il.com, tglx@...utronix.de, albert@...udflare.com,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perf/urgent] perf symbols: Fix crash in elf_section_by_name

Commit-ID:  155b3a13a65d4217316dbe094843f2a7df0711fa
Gitweb:     http://git.kernel.org/tip/155b3a13a65d4217316dbe094843f2a7df0711fa
Author:     Jiri Olsa <jolsa@...hat.com>
AuthorDate: Sun, 2 Mar 2014 14:32:07 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 10 Mar 2014 11:17:14 -0300

perf symbols: Fix crash in elf_section_by_name

Fixing crash in elf_section_by_name function caused by missing section
name in elf binary.

Reported-by: Albert Strasheim <albert@...udflare.com>
Signed-off-by: Jiri Olsa <jolsa@...hat.com>
Cc: Albert Strasheim <albert@...udflare.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1393767127-599-1-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol-elf.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 3e9f336..516d19f 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -151,15 +151,15 @@ Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 
 		gelf_getshdr(sec, shp);
 		str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
-		if (!strcmp(name, str)) {
+		if (str && !strcmp(name, str)) {
 			if (idx)
 				*idx = cnt;
-			break;
+			return sec;
 		}
 		++cnt;
 	}
 
-	return sec;
+	return NULL;
 }
 
 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
--
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