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netfilter: nf_conntrack_h323: restore boundary check correctness

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Since commit bc7d811ace ("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: bc7d811ace ("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>
This commit is contained in:
Jakub Jankowski 2019-04-25 23:46:50 +02:00 committed by Pablo Neira Ayuso
parent 33cc3c0cfa
commit f5e85ce8e7
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_conntrack_h323_asn1.c
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@ -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) if (bits % BITS_PER_BYTE > 0)
bytes++; bytes++;
if (*bs->cur + bytes > *bs->end) if (bs->cur + bytes > bs->end)
return 1; return 1;
return 0; return 0;