1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 3fa93665b4a3..df92e3ec9913 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -122,6 +122,7 @@ static struct buffer_head *
 ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
 {
         struct ext4_group_desc *desc;
+        struct ext4_sb_info *sbi = EXT4_SB(sb);
         struct buffer_head *bh = NULL;
         ext4_fsblk_t bitmap_blk;
         int err;
@@ -131,6 +132,12 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
                 return ERR_PTR(-EFSCORRUPTED);
 
         bitmap_blk = ext4_inode_bitmap(sb, desc);
+        if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
+            (bitmap_blk >= ext4_blocks_count(sbi->s_es))) {
+                ext4_error(sb, "Invalid inode bitmap blk %llu in "
+                           "block_group %u", bitmap_blk, block_group);
+                return ERR_PTR(-EFSCORRUPTED);
+        }
         bh = sb_getblk(sb, bitmap_blk);
         if (unlikely(!bh)) {
                 ext4_error(sb, "Cannot read inode bitmap - "