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@xxxxxxxxxx>
---
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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