Funda Wang <[email protected]> writes:
> Hello,
>
> I'm currently build libidn-1.24 with glibc 2.14.1/valgrind 3.7 under
> Mageia cauldron. All builds fine, except that `make check' failed
> after building. Log here:
>
> PASS: tst_idna
> ==25261== Invalid read of size 4
> ==25261== at 0x4E328E5: idna_to_ascii_4z (idna.c:526)
>
> i.e., idna2 and idna4 tests are failed. Is it a bug in libidn or
> valgrind? Regards.
It is a valgrind issue, the line reads:
size_t l = strlen (out) + 1 + strlen (buf) + 1;
It is the glibc implementation of strlen that is optimized to read past
the buffer, and valgrind detects this.
The normal way to deal with this is to write a valgrind suppressions
file.
I'm leaning more and more to disable valgrind by default, it generates
false positives like this... perhaps it is sufficient that I run it,
and people can enable it with --enable-valgrind-tests if they want it.
/Simon
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