Commit 2342b8d9 authored by Xin Long's avatar Xin Long Committed by David S. Miller

sctp: make sure stream nums can match optlen in sctp_setsockopt_reset_streams

Now in sctp_setsockopt_reset_streams, it only does the check
optlen < sizeof(*params) for optlen. But it's not enough, as
params->srs_number_streams should also match optlen.

If the streams in params->srs_stream_list are less than stream
nums in params->srs_number_streams, later when dereferencing
the stream list, it could cause a slab-out-of-bounds crash, as
reported by syzbot.

This patch is to fix it by also checking the stream numbers in
sctp_setsockopt_reset_streams to make sure at least it's not
greater than the streams in the list.

Fixes: 7f9d68ac ("sctp: implement sender-side procedures for SSN Reset Request Parameter")
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8f659a03
...@@ -3891,13 +3891,17 @@ static int sctp_setsockopt_reset_streams(struct sock *sk, ...@@ -3891,13 +3891,17 @@ static int sctp_setsockopt_reset_streams(struct sock *sk,
struct sctp_association *asoc; struct sctp_association *asoc;
int retval = -EINVAL; int retval = -EINVAL;
if (optlen < sizeof(struct sctp_reset_streams)) if (optlen < sizeof(*params))
return -EINVAL; return -EINVAL;
params = memdup_user(optval, optlen); params = memdup_user(optval, optlen);
if (IS_ERR(params)) if (IS_ERR(params))
return PTR_ERR(params); return PTR_ERR(params);
if (params->srs_number_streams * sizeof(__u16) >
optlen - sizeof(*params))
goto out;
asoc = sctp_id2assoc(sk, params->srs_assoc_id); asoc = sctp_id2assoc(sk, params->srs_assoc_id);
if (!asoc) if (!asoc)
goto out; goto out;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment