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| author | Mark H. Weaver <mhw@netris.org> | 2009-03-23 13:46:12 +0100 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2009-03-23 13:46:12 +0100 |
| commit | 534f81a5068799799e264fd162e9488a129f98d4 (patch) | |
| tree | 541efbf72b69d3c834b5aaffdb1b6e462344bf4f | |
| parent | d1238d5337e8e53cddea77c2a26d26b6eb5a982f (diff) | |
| download | linux-534f81a5068799799e264fd162e9488a129f98d4.tar.gz linux-534f81a5068799799e264fd162e9488a129f98d4.tar.bz2 linux-534f81a5068799799e264fd162e9488a129f98d4.zip | |
netfilter: nf_conntrack_tcp: fix unaligned memory access in tcp_sack
This patch fixes an unaligned memory access in tcp_sack while reading
sequence numbers from TCP selective acknowledgement options. Prior to
applying this patch, upstream linux-2.6.27.20 was occasionally
generating messages like this on my sparc64 system:
[54678.532071] Kernel unaligned access at TPC[6b17d4] tcp_packet+0xcd4/0xd00
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Patrick McHardy <kaber@trash.net>
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_tcp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index f3fd154d1ddd..56ac4ee77a1d 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -15,6 +15,7 @@ #include <linux/skbuff.h> #include <linux/ipv6.h> #include <net/ip6_checksum.h> +#include <asm/unaligned.h> #include <net/tcp.h> @@ -466,7 +467,7 @@ static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, for (i = 0; i < (opsize - TCPOLEN_SACK_BASE); i += TCPOLEN_SACK_PERBLOCK) { - tmp = ntohl(*((__be32 *)(ptr+i)+1)); + tmp = get_unaligned_be32((__be32 *)(ptr+i)+1); if (after(tmp, *sack)) *sack = tmp; |