valgrind: ignore SSE-based strlen invalid reads

Some versions of strlen use SSE to speed up the calculation and load 4
bytes at a time, even if it means reading past the end of the
allocated memory. This read is safe and when the strlen function is
inlined, it is not replaced by valgrind, which reports a
false-possitive.

Tell valgrind to ignore this particular error, as the read is, in
fact, safe. Current upstream-released version 3.6.1 is affected. Some
distributions have this fixed in their latest versions.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/valgrind/default.supp b/t/valgrind/default.supp
index 9e013fa3b25b82a10b71ceabfa664c796c4d7a3f..0a6724fcc45eed89d612b0e641fd3fe6d4231fcb 100644 (file)
--- a/t/valgrind/default.supp
+++ b/t/valgrind/default.supp
@@ -43,3 +43,9 @@
        fun:write_buffer
        fun:write_loose_object
 }
+
+{
+       ignore-sse-strlen-invalid-read-size
+       Memcheck:Addr4
+       fun:copy_ref
+}