From: Gao Feng <[email protected]>
The caller function "help" has already make sure the datalen could not be zero
before invoke find_pattern as a parameter by the following codes
if (dataoff >= skb->len) {
pr_debug("ftp: dataoff(%u) >= skblen(%u)\n", dataoff,
skb->len);
return NF_ACCEPT;
}
datalen = skb->len - dataoff;
And the latter codes "ends_in_nl = (fb_ptr[datalen - 1] == '\n');" use datalen
directly without checking if it is zero.
So it is unneccessary to check it in find_pattern too.
Signed-off-by: Gao Feng <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
---
net/netfilter/nf_conntrack_ftp.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index b6934b5edf7a..d49a2d410813 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -301,8 +301,6 @@ static int find_pattern(const char *data, size_t dlen,
size_t i = plen;
pr_debug("find_pattern `%s': dlen = %Zu\n", pattern, dlen);
- if (dlen == 0)
- return 0;
if (dlen <= plen) {
/* Short packet: try for partial? */
--
2.1.4
