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Kernel: Return EIO if attached device is gone in StorageDevicePartition

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The previous code will just do a nullptr-dereference if the underlying
device is gone, so instead gracefully return EIO error.
This commit is contained in:
Liav A 2023-06-30 11:22:51 +03:00 committed by Andrew Kaster
parent 67e028e4f4
commit f08f339e9a
Notes: sideshowbarker 2024-07-16 23:52:10 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/f08f339e9a
Pull-request: https://github.com/SerenityOS/serenity/pull/19714
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/Panky-codes
1 changed files with 8 additions and 2 deletions
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10
Kernel/Devices/Storage/StorageDevicePartition.cpp
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@ -47,24 +47,30 @@ void StorageDevicePartition::start_request(AsyncBlockDeviceRequest& request)
ErrorOr<size_t> StorageDevicePartition::read(OpenFileDescription& fd, u64 offset, UserOrKernelBuffer& outbuf, size_t len)
{
auto device = m_device.strong_ref();
if (!device)
return Error::from_errno(EIO);
// NOTE: The last available offset is actually just after the last addressable block.
if (offset >= (m_metadata.end_block() - m_metadata.start_block() + 1) * block_size())
return 0;
size_t nread = min(static_cast<size_t>((m_metadata.end_block() - m_metadata.start_block() + 1) - offset), len);
u64 adjust = m_metadata.start_block() * block_size();
dbgln_if(OFFD_DEBUG, "StorageDevicePartition::read offset={}, adjust={}, len={}", fd.offset(), adjust, nread);
return m_device.strong_ref()->read(fd, offset + adjust, outbuf, nread);
return device->read(fd, offset + adjust, outbuf, nread);
}
ErrorOr<size_t> StorageDevicePartition::write(OpenFileDescription& fd, u64 offset, UserOrKernelBuffer const& inbuf, size_t len)
{
auto device = m_device.strong_ref();
if (!device)
return Error::from_errno(EIO);
// NOTE: The last available offset is actually just after the last addressable block.
if (offset >= (m_metadata.end_block() - m_metadata.start_block() + 1) * block_size())
return Error::from_errno(ENOSPC);
size_t nwrite = min(static_cast<size_t>((m_metadata.end_block() - m_metadata.start_block() + 1) - offset), len);
u64 adjust = m_metadata.start_block() * block_size();
dbgln_if(OFFD_DEBUG, "StorageDevicePartition::write offset={}, adjust={}, len={}", offset, adjust, nwrite);
return m_device.strong_ref()->write(fd, offset + adjust, inbuf, nwrite);
return device->write(fd, offset + adjust, inbuf, nwrite);
}
StringView StorageDevicePartition::class_name() const