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sysctl: fix setting net.isr.dispatch during early boot

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Fix another collateral damage of r357614: netisr is initialised way before
malloc() is available hence it can't use sysctl_handle_string() that
allocates temporary buffer.  Handle that internally in
sysctl_netisr_dispatch_policy().

PR:		246114
Reported by:	delphij
Reviewed by:	kib
Approved by:	kib (mentor)
Differential Revision:	https://reviews.freebsd.org/D24858
This commit is contained in:
Pawel Biernacki 2020-05-16 17:05:44 +00:00
parent 6bc7175f31
commit 9033ad5f15
1 changed files with 23 additions and 8 deletions
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31
sys/net/netisr.c
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@ -345,19 +345,34 @@ static int
sysctl_netisr_dispatch_policy(SYSCTL_HANDLER_ARGS)
{
char tmp[NETISR_DISPATCH_POLICY_MAXSTR];
size_t len;
u_int dispatch_policy;
int error;
netisr_dispatch_policy_to_str(netisr_dispatch_policy, tmp,
sizeof(tmp));
error = sysctl_handle_string(oidp, tmp, sizeof(tmp), req);
if (error == 0 && req->newptr != NULL) {
error = netisr_dispatch_policy_from_str(tmp,
&dispatch_policy);
if (error == 0 && dispatch_policy == NETISR_DISPATCH_DEFAULT)
error = EINVAL;
if (error == 0)
netisr_dispatch_policy = dispatch_policy;
/*
* netisr is initialised very early during the boot when malloc isn't
* available yet so we can't use sysctl_handle_string() to process
* any non-default value that was potentially set via loader.
*/
if (req->newptr != NULL) {
len = req->newlen - req->newidx;
if (len >= NETISR_DISPATCH_POLICY_MAXSTR)
return (EINVAL);
error = SYSCTL_IN(req, tmp, len);
if (error == 0) {
tmp[len] = '\0';
error = netisr_dispatch_policy_from_str(tmp,
&dispatch_policy);
if (error == 0 &&
dispatch_policy == NETISR_DISPATCH_DEFAULT)
error = EINVAL;
if (error == 0)
netisr_dispatch_policy = dispatch_policy;
}
} else {
error = sysctl_handle_string(oidp, tmp, sizeof(tmp), req);
}
return (error);
}