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Commit 97f084b8 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'driver-core-3.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core 

Pull sysfs fixes from Greg Kroah-Hartman:
 "Here are two fixes for sysfs that resolve issues that have been found
  by the Trinity fuzz tool, causing oopses in sysfs.  They both have
  been in linux-next for a while to ensure that they do not cause any
  other problems."

* tag 'driver-core-3.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  sysfs: handle failure path correctly for readdir()
  sysfs: fix race between readdir and lseek
parents 1b6a4db2 e5110f41

fs/sysfs/dir.c

+16 −1
Original line number Diff line number Diff line
@@ -1020,6 +1020,8 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) 
		ino = parent_sd->s_ino;

		if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0)

			filp->f_pos++;

		else

			return 0;

	}

	if (filp->f_pos == 1) {

		if (parent_sd->s_parent)
@@ -1028,6 +1030,8 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) 
			ino = parent_sd->s_ino;

		if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0)

			filp->f_pos++;

		else

			return 0;

	}

	mutex_lock(&sysfs_mutex);

	for (pos = sysfs_dir_pos(ns, parent_sd, filp->f_pos, pos);
@@ -1058,10 +1062,21 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) 
	return 0;

}



static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence)

{

	struct inode *inode = file_inode(file);

	loff_t ret;



	mutex_lock(&inode->i_mutex);

	ret = generic_file_llseek(file, offset, whence);

	mutex_unlock(&inode->i_mutex);



	return ret;

}



const struct file_operations sysfs_dir_operations = {

	.read		= generic_read_dir,

	.readdir	= sysfs_readdir,

	.release	= sysfs_dir_release,

	.llseek		= generic_file_llseek,

	.llseek		= sysfs_dir_llseek,

};