Author: lwhsu
Date: Mon Feb 10 20:53:59 2020
New Revision: 357745
URL: https://svnweb.freebsd.org/changeset/base/357745
Log:
Restore the behavior of allowing empty string in a string sysctl
Added as a special case to avoid unnecessary memory operations.
Reviewed by: delphij
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/kern/kern_sysctl.c
Modified: head/sys/kern/kern_sysctl.c
==============================================================================
--- head/sys/kern/kern_sysctl.c Mon Feb 10 20:23:08 2020 (r357744)
+++ head/sys/kern/kern_sysctl.c Mon Feb 10 20:53:59 2020 (r357745)
@@ -1687,8 +1687,12 @@ sysctl_handle_string(SYSCTL_HANDLER_ARGS)
return (error);
if (req->newlen - req->newidx >= arg2 ||
- req->newlen - req->newidx <= 0) {
+ req->newlen - req->newidx < 0) {
error = EINVAL;
+ } else if (req->newlen - req->newidx == 0) {
+ sx_xlock(&sysctlstringlock);
+ ((char *)arg1)[0] = '\0';
+ sx_xunlock(&sysctlstringlock);
} else {
arg2 = req->newlen - req->newidx;
tmparg = malloc(arg2, M_SYSCTLTMP, M_WAITOK);
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