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Subject[patch for-5.8 2/4] dma-direct: re-encrypt memory if dma_direct_alloc_pages() fails
If arch_dma_set_uncached() fails after memory has been decrypted, it needs
to be re-encrypted before freeing.

Fixes: fa7e2247c572 ("dma-direct: make uncached_kernel_address more
general")
Cc: stable@vger.kernel.org # 5.7
Signed-off-by: David Rientjes <rientjes@google.com>
---
kernel/dma/direct.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -220,7 +220,7 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
arch_dma_prep_coherent(page, size);
ret = arch_dma_set_uncached(ret, size);
if (IS_ERR(ret))
- goto out_free_pages;
+ goto out_encrypt_pages;
}
done:
if (force_dma_unencrypted(dev))
@@ -228,6 +228,10 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
else
*dma_handle = phys_to_dma(dev, page_to_phys(page));
return ret;
+out_encrypt_pages:
+ if (force_dma_unencrypted(dev))
+ set_memory_encrypted((unsigned long)page_address(page),
+ 1 << get_order(size));
out_free_pages:
dma_free_contiguous(dev, page, size);
return NULL;
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