Date: Wed, 2 Oct 2019 21:01:24 +0000 (UTC) From: Ed Maste <emaste@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353021 - head/sys/kern Message-ID: <201910022101.x92L1OSM020820@repo.freebsd.org>
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Author: emaste Date: Wed Oct 2 21:01:23 2019 New Revision: 353021 URL: https://svnweb.freebsd.org/changeset/base/353021 Log: simplify path handling in sysctl_try_reclaim_vnode MAXPATHLEN / PATH_MAX includes space for the terminating NUL, and namei verifies the presence of the NUL. Thus there is no need to increase the buffer size here. The sysctl passes the string excluding the NUL, so req->newlen equal to PATH_MAX is too long. Reviewed by: kib MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D21876 Modified: head/sys/kern/vfs_subr.c Modified: head/sys/kern/vfs_subr.c ============================================================================== --- head/sys/kern/vfs_subr.c Wed Oct 2 19:13:35 2019 (r353020) +++ head/sys/kern/vfs_subr.c Wed Oct 2 21:01:23 2019 (r353021) @@ -351,10 +351,10 @@ sysctl_try_reclaim_vnode(SYSCTL_HANDLER_ARGS) if (req->newptr == NULL) return (EINVAL); - if (req->newlen > PATH_MAX) + if (req->newlen >= PATH_MAX) return (E2BIG); - buf = malloc(PATH_MAX + 1, M_TEMP, M_WAITOK); + buf = malloc(PATH_MAX, M_TEMP, M_WAITOK); error = SYSCTL_IN(req, buf, req->newlen); if (error != 0) goto out;
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