Date: Thu, 27 Sep 2018 18:32:15 +0000 (UTC) From: Gordon Tetlow <gordon@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org Subject: svn commit: r338979 - in releng: 11.1/sys/kern 11.2/sys/kern Message-ID: <201809271832.w8RIWFxV073579@repo.freebsd.org>
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Author: gordon Date: Thu Sep 27 18:32:14 2018 New Revision: 338979 URL: https://svnweb.freebsd.org/changeset/base/338979 Log: Fix NULL pointer dereference in freebsd4_getfsstat. [EN-18:10.syscall] Reported by: Thomas Barabosch, Fraunhofer FKIE Approved by: so Security: FreeBSD-EN-18:10.syscall Security: CVE-2018-17154 Modified: releng/11.1/sys/kern/vfs_syscalls.c releng/11.2/sys/kern/vfs_syscalls.c Modified: releng/11.1/sys/kern/vfs_syscalls.c ============================================================================== --- releng/11.1/sys/kern/vfs_syscalls.c Thu Sep 27 18:29:55 2018 (r338978) +++ releng/11.1/sys/kern/vfs_syscalls.c Thu Sep 27 18:32:14 2018 (r338979) @@ -641,6 +641,8 @@ freebsd4_getfsstat(td, uap) size = count * sizeof(struct statfs); error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, uap->mode); + if (buf == NULL) + return (EINVAL); td->td_retval[0] = count; if (size != 0) { sp = buf; Modified: releng/11.2/sys/kern/vfs_syscalls.c ============================================================================== --- releng/11.2/sys/kern/vfs_syscalls.c Thu Sep 27 18:29:55 2018 (r338978) +++ releng/11.2/sys/kern/vfs_syscalls.c Thu Sep 27 18:32:14 2018 (r338979) @@ -600,6 +600,8 @@ freebsd4_getfsstat(struct thread *td, struct freebsd4_ size = count * sizeof(struct statfs); error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, uap->mode); + if (buf == NULL) + return (EINVAL); td->td_retval[0] = count; if (size != 0) { sp = buf;
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