Messages in this thread Patch in this message | | | Date | Wed, 15 Jan 2014 19:35:08 +0200 | From | Rakesh Pandit <> | Subject | [PATCH] bfs: Fix sanity checks for empty files |
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Mount fails if file system image has empty files because of sanity check while reading superblock. For empty files disk offset to end of file (i_eoffset) is cpu_to_le32(-1). Sanity check comparison, which compares disk offset with file system size isn't valid for this value and hence is ignored with this patch.
Steps to reproduce:
$ dd if=/dev/zero of=bfs-image count=204800 $ mkfs.bfs bfs-image $ mkdir bfs-mount-point $ sudo mount -t bfs -o loop bfs-image bfs-mount-point/ $ cd bfs-mount-point/ $ sudo touch a $ cd .. $ sudo umount bfs-mount-point/ $ sudo mount -t bfs -o loop bfs-image bfs-mount-point/ mount: /dev/loop0: can't read superblock
$ dmesg [25526.689580] BFS-fs: bfs_fill_super(): Inode 0x00000003 corrupted
Signed-off-by: Rakesh Pandit <rakesh@tuxera.com> --- fs/bfs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c index 8defc6b..d69c464 100644 --- a/fs/bfs/inode.c +++ b/fs/bfs/inode.c @@ -420,7 +420,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent) if (i_sblock > info->si_blocks || i_eblock > info->si_blocks || i_sblock > i_eblock || - i_eoff > s_size || + (i_eoff != le32_to_cpu(-1) && i_eoff > s_size) || i_sblock * BFS_BSIZE > i_eoff) { printf("Inode 0x%08x corrupted\n", i); -- 1.7.11.7
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