diff options
| author | Stefano Brivio <sbrivio@redhat.com> | 2019-08-13 00:46:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-06 10:23:30 +0200 |
| commit | c5df65fd6f0650dfb4d878e35348e3a77ec992ea (patch) | |
| tree | b3d34ea0d0ec67d683613db9c9a8e223c89b470f /include | |
| parent | dc428ae89cd48b9a8b8b3bad6715bcc66653efe8 (diff) | |
ipv6: Fix return value of ipv6_mc_may_pull() for malformed packets
Commit ba5ea614622d ("bridge: simplify ip_mc_check_igmp() and
ipv6_mc_check_mld() calls") replaces direct calls to pskb_may_pull()
in br_ipv6_multicast_mld2_report() with calls to ipv6_mc_may_pull(),
that returns -EINVAL on buffers too short to be valid IPv6 packets,
while maintaining the previous handling of the return code.
This leads to the direct opposite of the intended effect: if the
packet is malformed, -EINVAL evaluates as true, and we'll happily
proceed with the processing.
Return 0 if the packet is too short, in the same way as this was
fixed for IPv4 by commit 083b78a9ed64 ("ip: fix ip_mc_may_pull()
return value").
I don't have a reproducer for this, unlike the one referred to by
the IPv4 commit, but this is clearly broken.
Fixes: ba5ea614622d ("bridge: simplify ip_mc_check_igmp() and ipv6_mc_check_mld() calls")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/addrconf.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/addrconf.h b/include/net/addrconf.h index becdad576859..3f62b347b04a 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -206,7 +206,7 @@ static inline int ipv6_mc_may_pull(struct sk_buff *skb, unsigned int len) { if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len) - return -EINVAL; + return 0; return pskb_may_pull(skb, len); } |