From 418c96ac151a16a5094a95d14252c92c1d47ec67 Mon Sep 17 00:00:00 2001 From: Leon Yu Date: Sun, 1 Jun 2014 05:37:25 +0000 Subject: [PATCH] net: filter: fix possible memory leak in __sk_prepare_filter() __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(). Fixes: bd4cf0ed331a ("net: filter: rework/optimize internal BPF interpreter's instruction set") Signed-off-by: Leon Yu Acked-by: Alexei Starovoitov Tested-by: Alexei Starovoitov Signed-off-by: David S. Miller --- 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. -- 2.7.4