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Reject attempts to register a TCP stack being unloaded.

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Reviewed by:	gallatin
MFC after:	2 weeks
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D20617
This commit is contained in:
John Baldwin 2019-06-27 22:34:05 +00:00
parent 404e646960
commit 6b69072acc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349474
1 changed files with 5 additions and 1 deletions
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6
sys/netinet/tcp_subr.c
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@ -798,8 +798,12 @@ register_tcp_functions_as_names(struct tcp_function_block *blk, int wait,
}
}
if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
*num_names = 0;
return (EINVAL);
}
refcount_init(&blk->tfb_refcnt, 0);
blk->tfb_flags = 0;
blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1);
for (i = 0; i < *num_names; i++) {
n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);