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Kernel: Make sure to drop region with interrupts enabled

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A region can drop an inode if it was mmaped from the inode and held the last
reference to it, and that may require some locking.
This commit is contained in:
Sergey Bugaev 2020-07-02 11:53:19 +03:00 committed by Andreas Kling
parent 6111cfda73
commit 3645b9e2a6
Notes: sideshowbarker 2024-07-19 05:10:08 +09:00 
Author: https://github.com/bugaevc
Commit: https://github.com/SerenityOS/serenity/commit/3645b9e2a62
Pull-request: https://github.com/SerenityOS/serenity/pull/2675
Reviewed-by: https://github.com/awesomekling
1 changed files with 3 additions and 1 deletions
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4
Kernel/Process.cpp
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@ -232,12 +232,14 @@ Region* Process::allocate_region_with_vmobject(VirtualAddress vaddr, size_t size
bool Process::deallocate_region(Region& region)
{
OwnPtr<Region> region_protector;
ScopedSpinLock lock(m_lock);
if (m_region_lookup_cache.region == &region)
m_region_lookup_cache.region = nullptr;
for (size_t i = 0; i < m_regions.size(); ++i) {
if (&m_regions[i] == &region) {
m_regions.unstable_take(i);
region_protector = m_regions.unstable_take(i);
return true;
}
}