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| author | Alexander Aring <aahringo@redhat.com> | 2023-04-17 09:00:52 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-04-19 09:04:16 +0100 |
| commit | 4e006c7a6dac0ead4c1bf606000aa90a372fc253 (patch) | |
| tree | 2ea0dbf86b5cd042424497464945f3a819a0f0e8 /net/ipv6 | |
| parent | 6f4833383e8514ea796d094e05c24889b8997fde (diff) | |
| download | lwn-4e006c7a6dac0ead4c1bf606000aa90a372fc253.tar.gz lwn-4e006c7a6dac0ead4c1bf606000aa90a372fc253.zip | |
net: rpl: fix rpl header size calculation
This patch fixes a missing 8 byte for the header size calculation. The
ipv6_rpl_srh_size() is used to check a skb_pull() on skb->data which
points to skb_transport_header(). Currently we only check on the
calculated addresses fields using CmprI and CmprE fields, see:
https://www.rfc-editor.org/rfc/rfc6554#section-3
there is however a missing 8 byte inside the calculation which stands
for the fields before the addresses field. Those 8 bytes are represented
by sizeof(struct ipv6_rpl_sr_hdr) expression.
Fixes: 8610c7c6e3bd ("net: ipv6: add support for rpl sr exthdr")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Reported-by: maxpl0it <maxpl0it@protonmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/rpl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/rpl.c b/net/ipv6/rpl.c index 488aec9e1a74..d1876f192225 100644 --- a/net/ipv6/rpl.c +++ b/net/ipv6/rpl.c @@ -32,7 +32,8 @@ static void *ipv6_rpl_segdata_pos(const struct ipv6_rpl_sr_hdr *hdr, int i) size_t ipv6_rpl_srh_size(unsigned char n, unsigned char cmpri, unsigned char cmpre) { - return (n * IPV6_PFXTAIL_LEN(cmpri)) + IPV6_PFXTAIL_LEN(cmpre); + return sizeof(struct ipv6_rpl_sr_hdr) + (n * IPV6_PFXTAIL_LEN(cmpri)) + + IPV6_PFXTAIL_LEN(cmpre); } void ipv6_rpl_srh_decompress(struct ipv6_rpl_sr_hdr *outhdr, |