diff options
| author | Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | 2021-06-28 21:13:41 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-06-29 00:34:50 +0200 |
| commit | 0c5dc070ff3d6246d22ddd931f23a6266249e3db (patch) | |
| tree | 434d6c40173e8b5529f60fcf72fdfb55bc359858 /net/sctp/input.c | |
| parent | flow_offload: action should not be NULL when it is referenced (diff) | |
| download | linux-0c5dc070ff3d6246d22ddd931f23a6266249e3db.tar.xz linux-0c5dc070ff3d6246d22ddd931f23a6266249e3db.zip | |
sctp: validate from_addr_param return
Ilja reported that, simply putting it, nothing was validating that
from_addr_param functions were operating on initialized memory. That is,
the parameter itself was being validated by sctp_walk_params, but it
doesn't check for types and their specific sizes and it could be a 0-length
one, causing from_addr_param to potentially work over the next parameter or
even uninitialized memory.
The fix here is to, in all calls to from_addr_param, check if enough space
is there for the wanted IP address type.
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/input.c')
| -rw-r--r-- | net/sctp/input.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/sctp/input.c b/net/sctp/input.c index d508f6f3dd08..8924e2e142c8 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -1131,7 +1131,8 @@ static struct sctp_association *__sctp_rcv_init_lookup(struct net *net, if (!af) continue; - af->from_addr_param(paddr, params.addr, sh->source, 0); + if (!af->from_addr_param(paddr, params.addr, sh->source, 0)) + continue; asoc = __sctp_lookup_association(net, laddr, paddr, transportp); if (asoc) @@ -1174,7 +1175,8 @@ static struct sctp_association *__sctp_rcv_asconf_lookup( if (unlikely(!af)) return NULL; - af->from_addr_param(&paddr, param, peer_port, 0); + if (af->from_addr_param(&paddr, param, peer_port, 0)) + return NULL; return __sctp_lookup_association(net, laddr, &paddr, transportp); } |