[ Upstream commit f5e85ce8e733c2547827f6268136b70b802eabdb ]
Since commit bc7d811ace4a ("netfilter: nf_ct_h323: Convert CHECK_BOUND macro to function"), NAT traversal for H.323 doesn't work, failing to parse H323-UserInformation. nf_h323_error_boundary() compares contents of the bitstring, not the addresses, preventing valid H.323 packets from being conntrack'd.
This looks like an oversight from when CHECK_BOUND macro was converted to a function.
To fix it, stop dereferencing bs->cur and bs->end.
Fixes: bc7d811ace4a ("netfilter: nf_ct_h323: Convert CHECK_BOUND macro to function") Signed-off-by: Jakub Jankowski shasta@toxcorp.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/netfilter/nf_conntrack_h323_asn1.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c index 1601275efe2d..4c2ef42e189c 100644 --- a/net/netfilter/nf_conntrack_h323_asn1.c +++ b/net/netfilter/nf_conntrack_h323_asn1.c @@ -172,7 +172,7 @@ static int nf_h323_error_boundary(struct bitstr *bs, size_t bytes, size_t bits) if (bits % BITS_PER_BYTE > 0) bytes++;
- if (*bs->cur + bytes > *bs->end) + if (bs->cur + bytes > bs->end) return 1;
return 0;