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author | David S. Miller <davem@davemloft.net> | 2013-08-16 15:37:26 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2013-08-16 15:37:26 -0700 |
commit | 2ff1cf12c9fe70e75e600404e6a4274b19d293ed (patch) | |
tree | beafddac0a8098e3f07d2ec60e44a2a7d006e605 /net/netfilter/xt_TCPOPTSTRIP.c | |
parent | 16b304f3404f8e0243d5ee2b70b68767b7b59b2b (diff) | |
parent | 0f7dd1aa8f959216f1faa71513b9d3c1a9065e5a (diff) | |
download | linux-2ff1cf12c9fe70e75e600404e6a4274b19d293ed.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'net/netfilter/xt_TCPOPTSTRIP.c')
-rw-r--r-- | net/netfilter/xt_TCPOPTSTRIP.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/net/netfilter/xt_TCPOPTSTRIP.c b/net/netfilter/xt_TCPOPTSTRIP.c index b68fa191710f..625fa1d636a0 100644 --- a/net/netfilter/xt_TCPOPTSTRIP.c +++ b/net/netfilter/xt_TCPOPTSTRIP.c @@ -38,7 +38,7 @@ tcpoptstrip_mangle_packet(struct sk_buff *skb, struct tcphdr *tcph; u_int16_t n, o; u_int8_t *opt; - int len; + int len, tcp_hdrlen; /* This is a fragment, no TCP header is available */ if (par->fragoff != 0) @@ -52,7 +52,9 @@ tcpoptstrip_mangle_packet(struct sk_buff *skb, return NF_DROP; tcph = (struct tcphdr *)(skb_network_header(skb) + tcphoff); - if (tcph->doff * 4 > len) + tcp_hdrlen = tcph->doff * 4; + + if (len < tcp_hdrlen) return NF_DROP; opt = (u_int8_t *)tcph; @@ -61,10 +63,10 @@ tcpoptstrip_mangle_packet(struct sk_buff *skb, * Walk through all TCP options - if we find some option to remove, * set all octets to %TCPOPT_NOP and adjust checksum. */ - for (i = sizeof(struct tcphdr); i < tcp_hdrlen(skb); i += optl) { + for (i = sizeof(struct tcphdr); i < tcp_hdrlen - 1; i += optl) { optl = optlen(opt, i); - if (i + optl > tcp_hdrlen(skb)) + if (i + optl > tcp_hdrlen) break; if (!tcpoptstrip_test_bit(info->strip_bmap, opt[i])) |