[NETFILTER]: SIP conntrack: fix out of bounds memory access

When checking for an @-sign in skp_epaddr_len, make sure not to
run over the packet boundaries.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/netfilter/ip_conntrack_sip.c b/net/ipv4/netfilter/ip_conntrack_sip.c
index 571d27e20910..11c588a10e6b 100644
--- a/net/ipv4/netfilter/ip_conntrack_sip.c
+++ b/net/ipv4/netfilter/ip_conntrack_sip.c
@@ -292,7 +292,7 @@ static int skp_epaddr_len(const char *dptr, const char *limit, int *shift)
                 dptr++;
         }
 
-        if (*dptr == '@') {
+        if (dptr <= limit && *dptr == '@') {
                 dptr++;
                 (*shift)++;
         } else
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index c93fb37a54fc..9dec11534678 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -312,7 +312,7 @@ static int skp_epaddr_len(struct nf_conn *ct, const char *dptr,
                 dptr++;
         }
 
-        if (*dptr == '@') {
+        if (dptr <= limit && *dptr == '@') {
                 dptr++;
                 (*shift)++;
         } else