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Kernel: Return ENOMEM in more places

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There are plenty of places in the kernel that aren't
checking if they actually got their allocation.

This fixes some of them, but definitely not all.

Fixes #3390
Fixes #3391

Also, let's make find_one_free_page() return nullptr
if it doesn't get a free index. This stops the kernel
crashing when out of memory and allows memory purging
to take place again.

Fixes #3487
This commit is contained in:
Luke 2020-09-16 18:47:47 +01:00 • committed by Andreas Kling
parent 2229b13c97
commit 68b361bd21
9 changed files with 34 additions and 12 deletions
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6
Kernel/Devices/SB16.cpp
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@ -235,8 +235,12 @@ KResultOr<size_t> SB16::write(FileDescription&, size_t, const UserOrKernelBuffer
{
if (!m_dma_region) {
auto page = MM.allocate_supervisor_physical_page();
if (!page)
return KResult(-ENOMEM);
auto vmobject = AnonymousVMObject::create_with_physical_page(*page);
m_dma_region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_SIZE, "SB16 DMA buffer", Region::Access::Write);
if (!m_dma_region)
return KResult(-ENOMEM);
}
#ifdef SB16_DEBUG
@ -245,7 +249,7 @@ KResultOr<size_t> SB16::write(FileDescription&, size_t, const UserOrKernelBuffer
ASSERT(length <= PAGE_SIZE);
const int BLOCK_SIZE = 32 * 1024;
if (length > BLOCK_SIZE) {
return -ENOSPC;
return KResult(-ENOSPC);
}
u8 mode = (u8)SampleFormat::Signed | (u8)SampleFormat::Stereo;