Author: jhb
Date: Tue Aug 27 00:29:30 2019
New Revision: 351523
URL: https://svnweb.freebsd.org/changeset/base/351523
Log:
MFC 349474: Reject attempts to register a TCP stack being unloaded.
Modified:
stable/11/sys/netinet/tcp_subr.c
Directory Properties:
stable/11/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/12/sys/netinet/tcp_subr.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/11/sys/netinet/tcp_subr.c
==============================================================================
--- stable/11/sys/netinet/tcp_subr.c Tue Aug 27 00:01:56 2019
(r351522)
+++ stable/11/sys/netinet/tcp_subr.c Tue Aug 27 00:29:30 2019
(r351523)
@@ -530,6 +530,9 @@ register_tcp_functions(struct tcp_function_block *blk,
return (EINVAL);
}
}
+ if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
+ return (EINVAL);
+ }
n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);
if (n == NULL) {
return (ENOMEM);
@@ -545,7 +548,6 @@ register_tcp_functions(struct tcp_function_block *blk,
return (EALREADY);
}
refcount_init(&blk->tfb_refcnt, 0);
- blk->tfb_flags = 0;
TAILQ_INSERT_TAIL(&t_functions, n, tf_next);
rw_wunlock(&tcp_function_lock);
return(0);
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