diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_ftp.c')
-rw-r--r-- | net/netfilter/nf_conntrack_ftp.c | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c index a414274338cf..617f744a2e3a 100644 --- a/net/netfilter/nf_conntrack_ftp.c +++ b/net/netfilter/nf_conntrack_ftp.c @@ -33,10 +33,6 @@ MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>"); MODULE_DESCRIPTION("ftp connection tracking helper"); MODULE_ALIAS("ip_conntrack_ftp"); MODULE_ALIAS_NFCT_HELPER(HELPER_NAME); - -/* This is slow, but it's simple. --RR */ -static char *ftp_buffer; - static DEFINE_SPINLOCK(nf_ftp_lock); #define MAX_PORTS 8 @@ -398,6 +394,9 @@ static int help(struct sk_buff *skb, return NF_ACCEPT; } + if (unlikely(skb_linearize(skb))) + return NF_DROP; + th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); if (th == NULL) return NF_ACCEPT; @@ -411,12 +410,9 @@ static int help(struct sk_buff *skb, } datalen = skb->len - dataoff; + /* seqadj (nat) uses ct->lock internally, nf_nat_ftp would cause deadlock */ spin_lock_bh(&nf_ftp_lock); - fb_ptr = skb_header_pointer(skb, dataoff, datalen, ftp_buffer); - if (!fb_ptr) { - spin_unlock_bh(&nf_ftp_lock); - return NF_ACCEPT; - } + fb_ptr = skb->data + dataoff; ends_in_nl = (fb_ptr[datalen - 1] == '\n'); seq = ntohl(th->seq) + datalen; @@ -571,7 +567,6 @@ static const struct nf_conntrack_expect_policy ftp_exp_policy = { static void __exit nf_conntrack_ftp_fini(void) { nf_conntrack_helpers_unregister(ftp, ports_c * 2); - kfree(ftp_buffer); } static int __init nf_conntrack_ftp_init(void) @@ -580,10 +575,6 @@ static int __init nf_conntrack_ftp_init(void) NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_ftp_master)); - ftp_buffer = kmalloc(65536, GFP_KERNEL); - if (!ftp_buffer) - return -ENOMEM; - if (ports_c == 0) ports[ports_c++] = FTP_PORT; @@ -603,7 +594,6 @@ static int __init nf_conntrack_ftp_init(void) ret = nf_conntrack_helpers_register(ftp, ports_c * 2); if (ret < 0) { pr_err("failed to register helpers\n"); - kfree(ftp_buffer); return ret; } |