Squashfs: add extra sanity checks at mount time
Add some extra sanity checks of the inode and directory structures. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
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@ -268,7 +268,7 @@ allocate_id_index_table:
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handle_fragments:
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fragments = le32_to_cpu(sblk->fragments);
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if (fragments == 0)
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goto allocate_root;
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goto check_directory_table;
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msblk->fragment_cache = squashfs_cache_init("fragment",
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SQUASHFS_CACHED_FRAGMENTS, msblk->block_size);
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@ -286,8 +286,22 @@ handle_fragments:
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msblk->fragment_index = NULL;
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goto failed_mount;
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}
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next_table = msblk->fragment_index[0];
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allocate_root:
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check_directory_table:
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/* Sanity check directory_table */
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if (msblk->directory_table >= next_table) {
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err = -EINVAL;
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goto failed_mount;
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}
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/* Sanity check inode_table */
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if (msblk->inode_table >= msblk->directory_table) {
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err = -EINVAL;
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goto failed_mount;
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}
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/* allocate root */
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root = new_inode(sb);
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if (!root) {
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err = -ENOMEM;
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