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Ext2FS: Block #0 can terminate an inode block list early.

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We were already handling this for the indirect blocks, but the direct ones
would happily consider #0 to be a valid block list entry.
This commit is contained in:
Andreas Kling 2019-05-25 19:19:43 +02:00
parent e1f922ded2
commit 75b0e5cce5
Notes: sideshowbarker 2024-07-19 13:57:21 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/75b0e5cce50
1 changed files with 9 additions and 1 deletions
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10
Kernel/FileSystem/Ext2FileSystem.cpp
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@ -269,6 +269,11 @@ Vector<Ext2FS::BlockIndex> Ext2FS::block_list_for_inode(const ext2_inode& e2inod
// NOTE: i_blocks is number of 512-byte blocks, not number of fs-blocks.
unsigned block_count = e2inode.i_blocks / (block_size() / 512);
#ifdef EXT2_DEBUG
dbgprintf("Ext2FS::block_list_for_inode(): i_size=%u, i_blocks=%u, block_count=%u\n", e2inode.i_size, block_count);
#endif
unsigned blocks_remaining = block_count;
Vector<BlockIndex> list;
if (include_block_list_blocks) {
@ -280,7 +285,10 @@ Vector<Ext2FS::BlockIndex> Ext2FS::block_list_for_inode(const ext2_inode& e2inod
unsigned direct_count = min(block_count, (unsigned)EXT2_NDIR_BLOCKS);
for (unsigned i = 0; i < direct_count; ++i) {
list.unchecked_append(e2inode.i_block[i]);
auto block_index = e2inode.i_block[i];
if (!block_index)
return list;
list.unchecked_append(block_index);
--blocks_remaining;
}