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authorDan Carpenter <dan.carpenter@oracle.com>2017-09-14 02:00:54 +0300
committerDavid S. Miller <davem@davemloft.net>2017-09-13 16:59:47 -0700
commitfa5f7b51fc3080c2b195fa87c7eca7c05e56f673 (patch)
tree1396532cdf8f95a14d447111aad03c60440aef9f /net/tls
parent6fa9c623a03c560178e0dcec23f59dbfd29b21b9 (diff)
sctp: potential read out of bounds in sctp_ulpevent_type_enabled()
This code causes a static checker warning because Smatch doesn't trust anything that comes from skb->data. I've reviewed this code and I do think skb->data can be controlled by the user here. The sctp_event_subscribe struct has 13 __u8 fields and we want to see if ours is non-zero. sn_type can be any value in the 0-USHRT_MAX range. We're subtracting SCTP_SN_TYPE_BASE which is 1 << 15 so we could read either before the start of the struct or after the end. This is a very old bug and it's surprising that it would go undetected for so long but my theory is that it just doesn't have a big impact so it would be hard to notice. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tls')
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