Author: rrs
Date: Wed Aug 21 10:45:28 2019
New Revision: 351328
URL: https://svnweb.freebsd.org/changeset/base/351328
Log:
Fix an issue when TSO and Rack play together. Basically
an retransmission of the initial SYN (with data) would
cause us to strip the SYN and decrement/increase offset/len
which then caused us a -1 offset and a panic.
Reported by: Larry Rosenman
(Michael Tuexen helped me debug this at the IETF)
Modified:
head/sys/netinet/tcp_stacks/rack.c
Modified: head/sys/netinet/tcp_stacks/rack.c
==============================================================================
--- head/sys/netinet/tcp_stacks/rack.c Wed Aug 21 10:42:31 2019
(r351327)
+++ head/sys/netinet/tcp_stacks/rack.c Wed Aug 21 10:45:28 2019
(r351328)
@@ -7405,9 +7405,6 @@ again:
(tp->t_state == TCPS_SYN_RECEIVED))
flags &= ~TH_SYN;
#endif
- sb_offset--, len++;
- if (sbavail(sb) == 0)
- len = 0;
}
/*
* Be careful not to send data and/or FIN on SYN segments. This
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