Date: Thu, 14 Dec 2017 07:55:11 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r326843 - stable/10/sbin/fsck_msdosfs Message-ID: <201712140755.vBE7tB63044769@repo.freebsd.org>
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Author: delphij Date: Thu Dec 14 07:55:11 2017 New Revision: 326843 URL: https://svnweb.freebsd.org/changeset/base/326843 Log: MFC r326391: Prevent OOB access on corrupted msdos directories. Submitted by: Veo Zhang <veo live com> Modified: stable/10/sbin/fsck_msdosfs/dir.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sbin/fsck_msdosfs/dir.c ============================================================================== --- stable/10/sbin/fsck_msdosfs/dir.c Thu Dec 14 07:52:38 2017 (r326842) +++ stable/10/sbin/fsck_msdosfs/dir.c Thu Dec 14 07:55:11 2017 (r326843) @@ -619,7 +619,7 @@ readDosDirSection(int f, struct bootblock *boot, struc dirent.name[8] = '\0'; for (k = 7; k >= 0 && dirent.name[k] == ' '; k--) dirent.name[k] = '\0'; - if (dirent.name[k] != '\0') + if (k < 0 || dirent.name[k] != '\0') k++; if (dirent.name[0] == SLOT_E5) dirent.name[0] = 0xe5;
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