USB: Fix breakage in ffs_fs_mount()

commit 2606b28aabd7dea1766c23a105e1124c95409c96 upstream.

	There's a bunch of failure exits in ffs_fs_mount() with
seriously broken recovery logics.  Most of that appears to stem
from misunderstanding of the ->kill_sb() semantics; unlike
->put_super() it is called for *all* superblocks of given type,
no matter how (in)complete the setup had been.  ->put_super()
is called only if ->s_root is not NULL; any failure prior to
setting ->s_root will have the call of ->put_super() skipped.
->kill_sb(), OTOH, awaits every superblock that has come from
sget().

Current behaviour of ffs_fs_mount():

We have struct ffs_sb_fill_data data on stack there.  We do
	ffs_dev = functionfs_acquire_dev_callback(dev_name);
and store that in data.private_data.  Then we call mount_nodev(),
passing it ffs_sb_fill() as a callback.  That will either fail
outright, or manage to call ffs_sb_fill().  There we allocate an
instance of struct ffs_data, slap the value of ffs_dev (picked
from data.private_data) into ffs->private_data and overwrite
data.private_data by storing ffs into an overlapping member
(data.ffs_data).  Then we store ffs into sb->s_fs_info and attempt
to set the rest of the things up (root inode, root dentry, then
create /ep0 there).  Any of those might fail.  Should that
happen, we get ffs_fs_kill_sb() called before mount_nodev()
returns.  If mount_nodev() fails for any reason whatsoever,
we proceed to
	functionfs_release_dev_callback(data.ffs_data);

That's broken in a lot of ways.  Suppose the thing has failed in
allocation of e.g. root inode or dentry.  We have
	functionfs_release_dev_callback(ffs);
	ffs_data_put(ffs);
done by ffs_fs_kill_sb() (ffs accessed via sb->s_fs_info), followed by
	functionfs_release_dev_callback(ffs);
from ffs_fs_mount() (via data.ffs_data).  Note that the second
functionfs_release_dev_callback() has every chance to be done to freed memory.

Suppose we fail *before* root inode allocation.  What happens then?
ffs_fs_kill_sb() doesn't do anything to ffs (it's either not called at all,
or it doesn't have a pointer to ffs stored in sb->s_fs_info).  And
	functionfs_release_dev_callback(data.ffs_data);
is called by ffs_fs_mount(), but here we are in nasal daemon country - we
are reading from a member of union we'd never stored into.  In practice,
we'll get what we used to store into the overlapping field, i.e. ffs_dev.
And then we get screwed, since we treat it (struct gfs_ffs_obj * in
disguise, returned by functionfs_acquire_dev_callback()) as struct
ffs_data *, pick what would've been ffs_data ->private_data from it
(*well* past the actual end of the struct gfs_ffs_obj - struct ffs_data
is much bigger) and poke in whatever it points to.

FWIW, there's a minor leak on top of all that in case if ffs_sb_fill()
fails on kstrdup() - ffs is obviously forgotten.

The thing is, there is no point in playing all those games with union.
Just allocate and initialize ffs_data *before* calling mount_nodev() and
pass a pointer to it via data.ffs_data.  And once it's stored in
sb->s_fs_info, clear data.ffs_data, so that ffs_fs_mount() knows that
it doesn't need to kill the sucker manually - from that point on
we'll have it done by ->kill_sb().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index f394f295d63d1b87927fb49fe9ebe3234fe0c635..b6e9d917221ea977e1180d5f2303c16952951135 100644 (file)
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -1034,37 +1034,19 @@ struct ffs_sb_fill_data {
        struct ffs_file_perms perms;
        umode_t root_mode;
        const char *dev_name;
-       union {
-               /* set by ffs_fs_mount(), read by ffs_sb_fill() */
-               void *private_data;
-               /* set by ffs_sb_fill(), read by ffs_fs_mount */
-               struct ffs_data *ffs_data;
-       };
+       struct ffs_data *ffs_data;
 };
 
 static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
 {
        struct ffs_sb_fill_data *data = _data;
        struct inode    *inode;
-       struct ffs_data *ffs;
+       struct ffs_data *ffs = data->ffs_data;
 
        ENTER();
 
-       /* Initialise data */
-       ffs = ffs_data_new();
-       if (unlikely(!ffs))
-               goto Enomem;
-
        ffs->sb              = sb;
-       ffs->dev_name        = kstrdup(data->dev_name, GFP_KERNEL);
-       if (unlikely(!ffs->dev_name))
-               goto Enomem;
-       ffs->file_perms      = data->perms;
-       ffs->private_data    = data->private_data;
-
-       /* used by the caller of this function */
-       data->ffs_data       = ffs;
-
+       data->ffs_data       = NULL;
        sb->s_fs_info        = ffs;
        sb->s_blocksize      = PAGE_CACHE_SIZE;
        sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
@@ -1080,17 +1062,14 @@ static int ffs_sb_fill(struct super_block *sb, void *_data, int silent)
                                  &data->perms);
        sb->s_root = d_make_root(inode);
        if (unlikely(!sb->s_root))
-               goto Enomem;
+               return -ENOMEM;
 
        /* EP0 file */
        if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs,
                                         &ffs_ep0_operations, NULL)))
-               goto Enomem;
+               return -ENOMEM;
 
        return 0;
-
-Enomem:
-       return -ENOMEM;
 }
 
 static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts)
@@ -1193,6 +1172,7 @@ ffs_fs_mount(struct file_system_type *t, int flags,
        struct dentry *rv;
        int ret;
        void *ffs_dev;
+       struct ffs_data *ffs;
 
        ENTER();
 
@@ -1200,18 +1180,30 @@ ffs_fs_mount(struct file_system_type *t, int flags,
        if (unlikely(ret < 0))
                return ERR_PTR(ret);
 
+       ffs = ffs_data_new();
+       if (unlikely(!ffs))
+               return ERR_PTR(-ENOMEM);
+       ffs->file_perms = data.perms;
+
+       ffs->dev_name = kstrdup(dev_name, GFP_KERNEL);
+       if (unlikely(!ffs->dev_name)) {
+               ffs_data_put(ffs);
+               return ERR_PTR(-ENOMEM);
+       }
+
        ffs_dev = functionfs_acquire_dev_callback(dev_name);
-       if (IS_ERR(ffs_dev))
-               return ffs_dev;
+       if (IS_ERR(ffs_dev)) {
+               ffs_data_put(ffs);
+               return ERR_CAST(ffs_dev);
+       }
+       ffs->private_data = ffs_dev;
+       data.ffs_data = ffs;
 
-       data.dev_name = dev_name;
-       data.private_data = ffs_dev;
        rv = mount_nodev(t, flags, &data, ffs_sb_fill);
-
-       /* data.ffs_data is set by ffs_sb_fill */
-       if (IS_ERR(rv))
+       if (IS_ERR(rv) && data.ffs_data) {
                functionfs_release_dev_callback(data.ffs_data);
-
+               ffs_data_put(data.ffs_data);
+       }
        return rv;
 }