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| author | Amerigo Wang <amwang@redhat.com> | 2012-10-09 17:48:16 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-10-10 22:33:30 -0400 |
| commit | 5aa8b572007c4bca1e6d3dd4c4820f1ae49d6bb2 (patch) | |
| tree | 81f64cc4441a8677763b89aff0df1fba8080b184 | |
| parent | 85457685e0e314f6902caaef976b3fd8ef4f51b4 (diff) | |
| download | linux-5aa8b572007c4bca1e6d3dd4c4820f1ae49d6bb2.tar.gz linux-5aa8b572007c4bca1e6d3dd4c4820f1ae49d6bb2.tar.bz2 linux-5aa8b572007c4bca1e6d3dd4c4820f1ae49d6bb2.zip | |
pktgen: fix crash when generating IPv6 packets
For IPv6, sizeof(struct ipv6hdr) = 40, thus the following
expression will result negative:
datalen = pkt_dev->cur_pkt_size - 14 -
sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
pkt_dev->pkt_overhead;
And, the check "if (datalen < sizeof(struct pktgen_hdr))" will be
passed as "datalen" is promoted to unsigned, therefore will cause
a crash later.
This is a quick fix by checking if "datalen" is negative. The following
patch will increase the default value of 'min_pkt_size' for IPv6.
This bug should exist for a long time, so Cc -stable too.
Cc: <stable@vger.kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/pktgen.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 148e73d2c451..e356b8d52bad 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -2927,7 +2927,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev, sizeof(struct ipv6hdr) - sizeof(struct udphdr) - pkt_dev->pkt_overhead; - if (datalen < sizeof(struct pktgen_hdr)) { + if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) { datalen = sizeof(struct pktgen_hdr); net_info_ratelimited("increased datalen to %d\n", datalen); } |