RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-16 16:24:59 +00:00
Code Issues Activity Actions

Kernel: Handle OOM from KBuffer usage in Ext2FS::get_bitmap_block()

Browse source 
Fixes up error handling on an OOM-able path, and removes one more usage
of KBuffer::create_with_size.
This commit is contained in:
Brian Gianforcaro 2021-08-01 02:21:20 -07:00 • committed by Andreas Kling
parent 43f930d3aa
commit 15cd5d324c
2 changed files with 9 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

10
Kernel/FileSystem/Ext2FileSystem.cpp
View file

@ -701,7 +701,7 @@ void Ext2FS::flush_writes()
}
for (auto& cached_bitmap : m_cached_bitmaps) {
if (cached_bitmap->dirty) {
auto buffer = UserOrKernelBuffer::for_kernel_buffer(cached_bitmap->buffer.data());
auto buffer = UserOrKernelBuffer::for_kernel_buffer(cached_bitmap->buffer->data());
if (auto result = write_block(cached_bitmap->bitmap_block_index, buffer, block_size()); result.is_error()) {
dbgln("Ext2FS[{}]::flush_writes(): Failed to write blocks: {}", fsid(), result.error());
}
@ -1499,13 +1499,15 @@ KResultOr<Ext2FS::CachedBitmap*> Ext2FS::get_bitmap_block(BlockIndex bitmap_bloc
return cached_bitmap;
}
auto block = KBuffer::create_with_size(block_size(), Region::Access::Read | Region::Access::Write, "Ext2FS: Cached bitmap block");
auto buffer = UserOrKernelBuffer::for_kernel_buffer(block.data());
auto block = KBuffer::try_create_with_size(block_size(), Region::Access::Read | Region::Access::Write, "Ext2FS: Cached bitmap block");
if (!block)
return ENOMEM;
auto buffer = UserOrKernelBuffer::for_kernel_buffer(block->data());
if (auto result = read_block(bitmap_block_index, &buffer, block_size()); result.is_error()) {
dbgln("Ext2FS: Failed to load bitmap block {}", bitmap_block_index);
return result;
}
auto new_bitmap = adopt_own_if_nonnull(new (nothrow) CachedBitmap(bitmap_block_index, move(block)));
auto new_bitmap = adopt_own_if_nonnull(new (nothrow) CachedBitmap(bitmap_block_index, block.release_nonnull()));
if (!new_bitmap)
return ENOMEM;
if (!m_cached_bitmaps.try_append(move(new_bitmap)))