KVM: arm64: Fix page leak in user_mem_abort()

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commit 5f9466b50c upstream.

The user_mem_abort() function acquires a page reference via
__kvm_faultin_pfn() early in its execution. However, the subsequent
checks for mismatched attributes between stage 1 and stage 2 mappings
would return an error code directly, bypassing the corresponding page
release.

Fix this by storing the error and releasing the unused page before
returning the error.

Fixes: 6d674e28f6 ("KVM: arm/arm64: Properly handle faulting of device mappings")
Fixes: 2a8dfab266 ("KVM: arm64: Block cacheable PFNMAP mapping")
Signed-off-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Fuad Tabba 2025-09-17 14:07:37 +01:00 • committed by Greg Kroah-Hartman

parent 4f7af3d8a1

commit 05ec0186b4

1 changed files with 7 additions and 2 deletions

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arch/arm64/kvm/mmu.c

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