diff options
| -rw-r--r-- | fs/cramfs/inode.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index 0c35e62f108d..9352487bd0fc 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -202,7 +202,8 @@ static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset, continue; blk_offset = (blocknr - buffer_blocknr[i]) << PAGE_SHIFT; blk_offset += offset; - if (blk_offset + len > BUFFER_SIZE) + if (blk_offset > BUFFER_SIZE || + blk_offset + len > BUFFER_SIZE) continue; return read_buffers[i] + blk_offset; } @@ -872,8 +873,8 @@ static int cramfs_readpage(struct file *file, struct page *page) if (unlikely(block_start & CRAMFS_BLK_FLAG_DIRECT_PTR)) { /* See comments on earlier code. */ u32 prev_start = block_start; - block_start = prev_start & ~CRAMFS_BLK_FLAGS; - block_start <<= CRAMFS_BLK_DIRECT_PTR_SHIFT; + block_start = prev_start & ~CRAMFS_BLK_FLAGS; + block_start <<= CRAMFS_BLK_DIRECT_PTR_SHIFT; if (prev_start & CRAMFS_BLK_FLAG_UNCOMPRESSED) { block_start += PAGE_SIZE; } else { |