On Sat, May 31, 2014 at 10:37 PM, Leon Yu <chianglun...@gmail.com> wrote:
> __sk_prepare_filter() was reworked in commit bd4cf0ed3 (net: filter:
> rework/optimize internal BPF interpreter's instruction set) so that it should
> have uncharged memory once things went wrong. However that work isn't
> complete.
> Error is handled only in __sk_migrate_filter() while memory can still leak in
> the error path right after sk_chk_filter().
>
> Signed-off-by: Leon Yu <chianglun...@gmail.com>
Nice catch. Thanks!
kmemleak confirmed the leak.
Acked-by: Alexei Starovoitov <a...@plumgrid.com>
Tested-by: Alexei Starovoitov <a...@plumgrid.com>
Fixes: bd4cf0ed331a ("net: filter: rework/optimize internal BPF
interpreter's instruction set")
Thankfully the fix doesn't have any conflicts with pending net-next patches.
> ---
> net/core/filter.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 9d79ca0..4aec7b9 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -1559,8 +1559,13 @@ static struct sk_filter *__sk_prepare_filter(struct
> sk_filter *fp,
> fp->jited = 0;
>
> err = sk_chk_filter(fp->insns, fp->len);
> - if (err)
> + if (err) {
> + if (sk != NULL)
> + sk_filter_uncharge(sk, fp);
> + else
> + kfree(fp);
> return ERR_PTR(err);
> + }
>
> /* Probe if we can JIT compile the filter and if so, do
> * the compilation of the filter.
> --
> 1.9.3
>
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