hfs/hfsplus: avoid WARN_ON() for sanity check, use proper error handling

commit cb7a95af78d29442b8294683eca4897544b8ef46 upstream.

Commit 558a16210318 ("hfs/hfsplus: use WARN_ON for sanity check") fixed
a build warning by turning a comment into a WARN_ON(), but it turns out
that syzbot then complains because it can trigger said warning with a
corrupted hfs image.

The warning actually does warn about a bad situation, but we are much
better off just handling it as the error it is.  So rather than warn
about us doing bad things, stop doing the bad things and return -EIO.

While at it, also fix a memory leak that was introduced by an earlier
fix for a similar syzbot warning situation, and add a check for one case
that historically wasn't handled at all (ie neither comment nor
subsequent WARN_ON).

Reported-by: syzbot+7bb7cd3595533513a9e7@syzkaller.appspotmail.com
Fixes: 558a16210318 ("hfs/hfsplus: use WARN_ON for sanity check")
Fixes: 8d824e69d9f3 ("hfs: fix OOB Read in __hfs_brec_find")
Link: https://lore.kernel.org/lkml/000000000000dbce4e05f170f289@google.com/
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Viacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index a537cebf7a628a9c622ec8622d69e1ae5c260446..ee2ea5532e69b4b67dae08ea364248819f8f8e94 100644 (file)
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -453,15 +453,16 @@ int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
                /* panic? */
                return -EIO;
 
+       res = -EIO;
        if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
-               return -EIO;
+               goto out;
        fd.search_key->cat = HFS_I(main_inode)->cat_key;
        if (hfs_brec_find(&fd))
-               /* panic? */
                goto out;
 
        if (S_ISDIR(main_inode->i_mode)) {
-               WARN_ON(fd.entrylength < sizeof(struct hfs_cat_dir));
+               if (fd.entrylength < sizeof(struct hfs_cat_dir))
+                       goto out;
                hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
                           sizeof(struct hfs_cat_dir));
                if (rec.type != HFS_CDR_DIR ||
@@ -474,6 +475,8 @@ int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
                hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
                            sizeof(struct hfs_cat_dir));
        } else if (HFS_IS_RSRC(inode)) {
+               if (fd.entrylength < sizeof(struct hfs_cat_file))
+                       goto out;
                hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
                               sizeof(struct hfs_cat_file));
                hfs_inode_write_fork(inode, rec.file.RExtRec,
@@ -481,7 +484,8 @@ int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
                hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
                                sizeof(struct hfs_cat_file));
        } else {
-               WARN_ON(fd.entrylength < sizeof(struct hfs_cat_file));
+               if (fd.entrylength < sizeof(struct hfs_cat_file))
+                       goto out;
                hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
                           sizeof(struct hfs_cat_file));
                if (rec.type != HFS_CDR_FIL ||
@@ -498,9 +502,10 @@ int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
                hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
                            sizeof(struct hfs_cat_file));
        }
+       res = 0;
 out:
        hfs_find_exit(&fd);
-       return 0;
+       return res;
 }
 
 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,