hfsplus: fix NULL dereference in hfsplus_lookup() (CVE-2018-14617)
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@ -14,6 +14,7 @@ linux (4.18.6-2) UNRELEASED; urgency=medium
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(Closes: #887045, #886292)
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* btrfs: relocation: Only remove reloc rb_trees if reloc control has been
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initialized (CVE-2018-14609)
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* hfsplus: fix NULL dereference in hfsplus_lookup() (CVE-2018-14617)
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-- Ben Hutchings <ben@decadent.org.uk> Sat, 08 Sep 2018 23:24:31 +0100
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56
debian/patches/bugfix/all/hfsplus-fix-NULL-dereference-in-hfsplus_lookup.patch
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56
debian/patches/bugfix/all/hfsplus-fix-NULL-dereference-in-hfsplus_lookup.patch
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@ -0,0 +1,56 @@
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From: =?UTF-8?q?Ernesto=20A=2E=20Fern=C3=A1ndez?=
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<ernesto.mnd.fernandez@gmail.com>
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Date: Thu, 23 Aug 2018 17:00:25 -0700
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Subject: hfsplus: fix NULL dereference in hfsplus_lookup()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Origin: https://git.kernel.org/linus/a7ec7a4193a2eb3b5341243fc0b621c1ac9e4ec4
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An HFS+ filesystem can be mounted read-only without having a metadata
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directory, which is needed to support hardlinks. But if the catalog
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data is corrupted, a directory lookup may still find dentries claiming
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to be hardlinks.
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hfsplus_lookup() does check that ->hidden_dir is not NULL in such a
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situation, but mistakenly does so after dereferencing it for the first
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time. Reorder this check to prevent a crash.
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This happens when looking up corrupted catalog data (dentry) on a
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filesystem with no metadata directory (this could only ever happen on a
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read-only mount). Wen Xu sent the replication steps in detail to the
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fsdevel list: https://bugzilla.kernel.org/show_bug.cgi?id=200297
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Link: http://lkml.kernel.org/r/20180712215344.q44dyrhymm4ajkao@eaf
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Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
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Reported-by: Wen Xu <wen.xu@gatech.edu>
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Cc: Viacheslav Dubeyko <slava@dubeyko.com>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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---
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fs/hfsplus/dir.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
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index c5a70f83dbe7..f37662675c3a 100644
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--- a/fs/hfsplus/dir.c
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+++ b/fs/hfsplus/dir.c
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@@ -77,13 +77,13 @@ static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
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cpu_to_be32(HFSP_HARDLINK_TYPE) &&
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entry.file.user_info.fdCreator ==
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cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
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+ HFSPLUS_SB(sb)->hidden_dir &&
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(entry.file.create_date ==
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HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
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create_date ||
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entry.file.create_date ==
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HFSPLUS_I(d_inode(sb->s_root))->
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- create_date) &&
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- HFSPLUS_SB(sb)->hidden_dir) {
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+ create_date)) {
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struct qstr str;
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char name[32];
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--
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2.19.0
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@ -144,6 +144,7 @@ features/all/lockdown/arm64-add-kernel-config-option-to-lock-down-when.patch
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debian/i386-686-pae-pci-set-pci-nobios-by-default.patch
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bugfix/all/Revert-net-increase-fragment-memory-usage-limits.patch
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bugfix/all/btrfs-relocation-Only-remove-reloc-rb_trees-if-reloc.patch
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bugfix/all/hfsplus-fix-NULL-dereference-in-hfsplus_lookup.patch
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# Fix exported symbol versions
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bugfix/all/module-disable-matching-missing-version-crc.patch
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