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sctp: validate from_addr_param return

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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>
This commit is contained in:
Marcelo Ricardo Leitner
2021-06-28 16:13:41 -03:00
committed by David S. Miller
parent 9ea3e52c5b
commit 0c5dc070ff
6 changed files with 44 additions and 26 deletions
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2
include/net/sctp/structs.h
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@@ -461,7 +461,7 @@ struct sctp_af {
int saddr);
void (*from_sk) (union sctp_addr *,
struct sock *sk);
void (*from_addr_param) (union sctp_addr *,
bool (*from_addr_param) (union sctp_addr *,
union sctp_addr_param *,
__be16 port, int iif);
int (*to_addr_param) (const union sctp_addr *,