[patch for-5.8 2/4] dma-direct: re-encrypt memory if dma_direct_alloc_pages() fails

[David Rientjes]

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: sta...@vger.kernel.org # 5.7
Signed-off-by: David Rientjes <rient...@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;