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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: bd4cf0ed33 ("net: filter: rework/optimize internal BPF interpreter's instruction set")
Signed-off-by: Leon Yu <chianglungyu@gmail.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Tested-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Leon Yu 2014-06-01 05:37:25 +00:00 committed by David S. Miller
parent 3aab01d800
commit 418c96ac15
1 changed files with 6 additions and 1 deletions
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7
net/core/filter.c
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@ -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.