From 5b5f9560354dc5a3a27ce57a86aec6b98531ee21 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 8 Jan 2012 15:38:27 -0500 Subject: functionfs: unfuck failure exits on mount * if you do dput() of root dentry, do *not* follow that with iput() of root inode. * while we are at it, don't do that dput() at all - you are leaving the pointer in ->s_root and your ->kill_sb() will be very unhappy with that. It will do proper dput(), though, so the easiest way is to leave that to it entirely. * freeing ->s_fs_info is also best left to ->kill_sb() (which will do it anyway), especially since we leave the pointer in place. * that xchg() in ->kill_sb() is not a bug per se, but it's a plain and simple masturbation with fewer excuses than Onan had... Signed-off-by: Al Viro --- drivers/usb/gadget/f_fs.c | 31 +++++++++++-------------------- 1 file changed, 11 insertions(+), 20 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c index acb38004eec0..b5f6f9fef9c7 100644 --- a/drivers/usb/gadget/f_fs.c +++ b/drivers/usb/gadget/f_fs.c @@ -1037,7 +1037,6 @@ static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) { struct ffs_sb_fill_data *data = _data; struct inode *inode; - struct dentry *d; struct ffs_data *ffs; ENTER(); @@ -1045,7 +1044,7 @@ static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) /* Initialise data */ ffs = ffs_data_new(); if (unlikely(!ffs)) - goto enomem0; + goto Enomem; ffs->sb = sb; ffs->dev_name = data->dev_name; @@ -1065,26 +1064,21 @@ static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) &simple_dir_inode_operations, &data->perms); if (unlikely(!inode)) - goto enomem1; - d = d_alloc_root(inode); - if (unlikely(!d)) - goto enomem2; - sb->s_root = d; + goto Enomem; + sb->s_root = d_alloc_root(inode); + if (unlikely(!sb->s_root)) { + iput(inode); + goto Enomem; + } /* EP0 file */ if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, &ffs_ep0_operations, NULL))) - goto enomem3; + goto Enomem; return 0; -enomem3: - dput(d); -enomem2: - iput(inode); -enomem1: - ffs_data_put(ffs); -enomem0: +Enomem: return -ENOMEM; } @@ -1196,14 +1190,11 @@ ffs_fs_mount(struct file_system_type *t, int flags, static void ffs_fs_kill_sb(struct super_block *sb) { - void *ptr; - ENTER(); kill_litter_super(sb); - ptr = xchg(&sb->s_fs_info, NULL); - if (ptr) - ffs_data_put(ptr); + if (sb->s_fs_info) + ffs_data_put(sb->s_fs_info); } static struct file_system_type ffs_fs_type = { -- cgit v1.2.3 From 87da5b3264c8514b85c6c6e8ef51b9440eee2030 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 8 Jan 2012 15:59:45 -0500 Subject: ... and the same for gadgetfs Signed-off-by: Al Viro --- drivers/usb/gadget/inode.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c index 6ccae2707e59..6b7ea25af0fe 100644 --- a/drivers/usb/gadget/inode.c +++ b/drivers/usb/gadget/inode.c @@ -2035,7 +2035,6 @@ static int gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) { struct inode *inode; - struct dentry *d; struct dev_data *dev; if (the_device) @@ -2058,24 +2057,27 @@ gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) NULL, &simple_dir_operations, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) - goto enomem0; + goto Enomem; inode->i_op = &simple_dir_inode_operations; - if (!(d = d_alloc_root (inode))) - goto enomem1; - sb->s_root = d; + if (!(sb->s_root = d_alloc_root (inode))) { + iput(inode); + goto Enomem; + } /* the ep0 file is named after the controller we expect; * user mode code can use it for sanity checks, like we do. */ dev = dev_new (); if (!dev) - goto enomem2; + goto Enomem; dev->sb = sb; if (!gadgetfs_create_file (sb, CHIP, dev, &dev_init_operations, - &dev->dentry)) - goto enomem3; + &dev->dentry)) { + put_dev(dev); + goto Enomem; + } /* other endpoint files are available after hardware setup, * from binding to a controller. @@ -2083,13 +2085,7 @@ gadgetfs_fill_super (struct super_block *sb, void *opts, int silent) the_device = dev; return 0; -enomem3: - put_dev (dev); -enomem2: - dput (d); -enomem1: - iput (inode); -enomem0: +Enomem: return -ENOMEM; } -- cgit v1.2.3