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| author |   yujuan.qi <yujuan.qi@mediatek.com> | 2017-07-31 11:23:01 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-08-01 15:31:23 -0700 |
| commit | 40413955ee265a5e42f710940ec78f5450d49149 (patch) | |
| tree | e2e0c22b0f753899a3c190581bbbf6d392bc8a0b /net/ipv4/cipso_ipv4.c | |
| parent | Merge branch 'ethernet-ti-cpts-fix-tx-timestamping-timeout' (diff) | |
| download | linux-dev-40413955ee265a5e42f710940ec78f5450d49149.tar.xz linux-dev-40413955ee265a5e42f710940ec78f5450d49149.zip | |
Cipso: cipso_v4_optptr enter infinite loop
in for(),if((optlen > 0) && (optptr[1] == 0)), enter infinite loop.
Test: receive a packet which the ip length > 20 and the first byte of ip option is 0, produce this issue
Signed-off-by: yujuan.qi <yujuan.qi@mediatek.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/cipso_ipv4.c')
| -rw-r--r-- | net/ipv4/cipso_ipv4.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c index c4c6e1969ed0..2ae8f54cb321 100644 --- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -1523,9 +1523,17 @@ unsigned char *cipso_v4_optptr(const struct sk_buff *skb) int taglen; for (optlen = iph->ihl*4 - sizeof(struct iphdr); optlen > 0; ) { - if (optptr[0] == IPOPT_CIPSO) + switch (optptr[0]) { + case IPOPT_CIPSO: return optptr; - taglen = optptr[1]; + case IPOPT_END: + return NULL; + case IPOPT_NOOP: + taglen = 1; + break; + default: + taglen = optptr[1]; + } optlen -= taglen; optptr += taglen; } |