[PATCH 05/16] perf symbol: don't try to synthesize plt without dynstr.

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If .dynsym exists but .dynstr is empty (NO_BITS or size==0), a segfault
occurs. Avoid this by checking that .dynstr is not empty.

Signed-off-by: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx>
---
 tools/perf/util/symbol.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 254d4d8..8ae159a 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1077,6 +1077,9 @@ dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map,
 	if (symstrs == NULL)
 		goto out_elf_end;
 
+	if (symstrs->d_size == 0)
+		goto out_elf_end;
+
 	nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 	plt_offset = shdr_plt.sh_offset;
 
-- 
1.7.11.3

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