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path: root/fs/bfs/inode.c
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Diffstat (limited to 'fs/bfs/inode.c')
-rw-r--r--fs/bfs/inode.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index 0ed57b5ee012..cc4062d12ca2 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -213,6 +213,9 @@ static void bfs_put_super(struct super_block *s)
{
struct bfs_sb_info *info = BFS_SB(s);
+ if (!info)
+ return;
+
brelse(info->si_sbh);
mutex_destroy(&info->bfs_lock);
kfree(info->si_imap);
@@ -327,6 +330,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
unsigned i, imap_len;
struct bfs_sb_info *info;
long ret = -EINVAL;
+ unsigned long i_sblock, i_eblock, i_eoff, s_size;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
@@ -350,6 +354,12 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
s->s_magic = BFS_MAGIC;
info->si_sbh = bh;
+
+ if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
+ printf("Superblock is corrupted\n");
+ goto out;
+ }
+
info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
sizeof(struct bfs_inode)
+ BFS_ROOT_INO - 1;
@@ -380,6 +390,18 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
info->si_freei = 0;
info->si_lf_eblk = 0;
+
+ /* can we read the last block? */
+ bh = sb_bread(s, info->si_blocks - 1);
+ if (!bh) {
+ printf("Last block not available: %lu\n", info->si_blocks - 1);
+ iput(inode);
+ ret = -EIO;
+ kfree(info->si_imap);
+ goto out;
+ }
+ brelse(bh);
+
bh = NULL;
for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
struct bfs_inode *di;
@@ -397,6 +419,29 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
di = (struct bfs_inode *)bh->b_data + off;
+ /* test if filesystem is not corrupted */
+
+ i_eoff = le32_to_cpu(di->i_eoffset);
+ i_sblock = le32_to_cpu(di->i_sblock);
+ i_eblock = le32_to_cpu(di->i_eblock);
+ s_size = le32_to_cpu(bfs_sb->s_end);
+
+ if (i_sblock > info->si_blocks ||
+ i_eblock > info->si_blocks ||
+ i_sblock > i_eblock ||
+ i_eoff > s_size ||
+ i_sblock * BFS_BSIZE > i_eoff) {
+
+ printf("Inode 0x%08x corrupted\n", i);
+
+ brelse(bh);
+ s->s_root = NULL;
+ kfree(info->si_imap);
+ kfree(info);
+ s->s_fs_info = NULL;
+ return -EIO;
+ }
+
if (!di->i_ino) {
info->si_freei++;
continue;