Commit fb0d366b authored by Kris Katterjohn's avatar Kris Katterjohn Committed by David S. Miller

[NET]: Reject socket filter if division by constant zero is attempted.

This way we don't have to check it in sk_run_filter().
Signed-off-by: default avatarKris Katterjohn <kjak@users.sourceforge.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aa875166
......@@ -116,8 +116,6 @@ int sk_run_filter(struct sk_buff *skb, struct sock_filter *filter, int flen)
A /= X;
continue;
case BPF_ALU|BPF_DIV|BPF_K:
if (fentry->k == 0)
return 0;
A /= fentry->k;
continue;
case BPF_ALU|BPF_AND|BPF_X:
......@@ -320,6 +318,10 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
}
}
/* check for division by zero -Kris Katterjohn 2005-10-30 */
if (ftest->code == (BPF_ALU|BPF_DIV|BPF_K) && ftest->k == 0)
return -EINVAL;
/* check that memory operations use valid addresses. */
if (ftest->k >= BPF_MEMWORDS) {
/* but it might not be a memory operation... */
......
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