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Mon, 04 May 2026 16:31:49 -0700 (PDT) X-Received: by 2002:a05:690e:480c:b0:65c:2066:a9c1 with SMTP id 956f58d0204a3-65c69ecfc79mr685812d50.42.1777937508761; Mon, 04 May 2026 16:31:48 -0700 (PDT) Received: from li-4c4c4544-0032-4210-804c-c3c04f423534.ibm.com ([2600:1700:6476:1430::29]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-65c2df83478sm6167827d50.2.2026.05.04.16.31.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 May 2026 16:31:47 -0700 (PDT) Message-ID: Subject: Re: [PATCH 3/3] hfsplus: fix null pointer dereference in hfsplus_create_attributes_file From: Viacheslav Dubeyko To: Tristan Madani , Viacheslav Dubeyko , John Paul Adrian Glaubitz , Yangtao Li Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Tristan Madani , syzbot+bc70a12e438dadba4fb4@syzkaller.appspotmail.com Date: Mon, 04 May 2026 16:31:46 -0700 In-Reply-To: <20260501110218.29906-3-tristmd@gmail.com> References: <20260501110218.29906-1-tristmd@gmail.com> <20260501110218.29906-3-tristmd@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.0 (3.60.0-1.fc44app2) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2026-05-01 at 11:02 +0000, Tristan Madani wrote: > From: Tristan Madani >=20 > hfsplus_create_attributes_file() calls hfsplus_mark_inode_dirty() with > HFSPLUS_ATTR_TREE_I(sb) before sbi->attr_tree has been set by > hfs_btree_open(). HFSPLUS_ATTR_TREE_I dereferences sbi->attr_tree to > reach ->inode, causing a null pointer dereference when attr_tree is > still NULL. >=20 > Move the mark_dirty call to after hfs_btree_open() and guard it with a > NULL check on sbi->attr_tree. >=20 > Reported-by: syzbot+bc70a12e438dadba4fb4@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=3Dbc70a12e438dadba4fb4 > Tested-by: syzbot+bc70a12e438dadba4fb4@syzkaller.appspotmail.com > Fixes: ee8422d00b7c ("hfsplus: fix potential Allocation File corruption a= fter fsync") > Cc: stable@vger.kernel.org > Signed-off-by: Tristan Madani > --- > fs/hfsplus/xattr.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c > index 452a1f9becb2d..1ea9f313368c5 100644 > --- a/fs/hfsplus/xattr.c > +++ b/fs/hfsplus/xattr.c > @@ -317,12 +317,13 @@ static int hfsplus_create_attributes_file(struct su= per_block *sb) > next_node++; > } > =20 > - hfsplus_mark_inode_dirty(HFSPLUS_ATTR_TREE_I(sb), HFSPLUS_I_ATTR_DIRTY)= ; > hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY); > =20 > sbi->attr_tree =3D hfs_btree_open(sb, HFSPLUS_ATTR_CNID); > if (!sbi->attr_tree) > pr_err("failed to load attributes file\n"); > + else > + hfsplus_mark_inode_dirty(HFSPLUS_ATTR_TREE_I(sb), HFSPLUS_I_ATTR_DIRTY= ); > =20 > failed_header_node_init: > kfree(buf); This patch already fixes the issue: https://lore.kernel.org/linux-fsdevel/6601b6ec0de087674f60566db950449c4e821= bfc.camel@redhat.com/ Thanks, Slava.