Commit ff3aea0e authored by Dave Johnson's avatar Dave Johnson Committed by Linus Torvalds
Browse files

[PATCH] cramfs mounts provide corrupted content since 2.6.15 



Fix handling of cramfs images created by util-linux containing empty
regular files.  Images created by cramfstools 1.x were ok.

Fill out inode contents in cramfs_iget5_set() instead of get_cramfs_inode()
to prevent issues if cramfs_iget5_test() is called with I_LOCK|I_NEW still
set.

Signed-off-by: default avatarDave Johnson <djohnson+linux-kernel@sw.starentnetworks.com>
Cc: Olaf Hering <olh@suse.de>
Cc: Chris Mason <mason@suse.com>
Cc: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9888e6fa

fs/cramfs/inode.c

+29 −31
Original line number Diff line number Diff line
@@ -36,7 +36,7 @@ static DECLARE_MUTEX(read_mutex); 


/* These two macros may change in future, to provide better st_ino

   semantics. */

#define CRAMINO(x)	((x)->offset?(x)->offset<<2:1)

#define CRAMINO(x)	(((x)->offset && (x)->size)?(x)->offset<<2:1)

#define OFFSET(x)	((x)->i_ino)
@@ -66,20 +66,8 @@ static int cramfs_iget5_test(struct inode *inode, void *opaque) 


static int cramfs_iget5_set(struct inode *inode, void *opaque)

{

	struct cramfs_inode *cramfs_inode = opaque;

	inode->i_ino = CRAMINO(cramfs_inode);

	return 0;

}



static struct inode *get_cramfs_inode(struct super_block *sb,

				struct cramfs_inode * cramfs_inode)

{

	struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),

					    cramfs_iget5_test, cramfs_iget5_set,

					    cramfs_inode);

	static struct timespec zerotime;



	if (inode && (inode->i_state & I_NEW)) {

	struct cramfs_inode *cramfs_inode = opaque;

	inode->i_mode = cramfs_inode->mode;

	inode->i_uid = cramfs_inode->uid;

	inode->i_size = cramfs_inode->size;
@@ -108,6 +96,16 @@ static struct inode *get_cramfs_inode(struct super_block *sb, 
		init_special_inode(inode, inode->i_mode,

			old_decode_dev(cramfs_inode->size));

	}

	return 0;

}



static struct inode *get_cramfs_inode(struct super_block *sb,

				struct cramfs_inode * cramfs_inode)

{

	struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),

					    cramfs_iget5_test, cramfs_iget5_set,

					    cramfs_inode);

	if (inode && (inode->i_state & I_NEW)) {

		unlock_new_inode(inode);

	}

	return inode;

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