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[crypto] Allow cms_decrypt() to be called on unregistered images 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1171/head
Michael Brown 2024-08-29 23:31:10 +01:00
parent 72316b820d
commit 5e69cf08d7
1 changed files with 15 additions and 9 deletions
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18
src/crypto/cms.c
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@ -1101,13 +1101,15 @@ int cms_decrypt ( struct cms_message *cms, struct image *image,
/* Duplicate cipher context for potential reencryption on error */
memcpy ( ctxdup, ctx, cipher->ctxsize );
/* Temporarily unregister image */
image_get ( image );
unregister_image ( image );
/* Clear trusted flag before modifying image */
image_untrust ( image );
/* Temporarily unregister image, if applicable */
if ( original_flags & IMAGE_REGISTERED ) {
image_get ( image );
unregister_image ( image );
}
/* Decrypt one block at a time */
offset = 0;
remaining = image->len;
@ -1167,10 +1169,12 @@ int cms_decrypt ( struct cms_message *cms, struct image *image,
copy_to_user ( image->data, ( offset - frag_len ), tmp, frag_len );
image->len -= pad_len;
/* Clear image type and re-register image */
/* Clear image type and re-register image, if applicable */
image->type = NULL;
if ( original_flags & IMAGE_REGISTERED ) {
register_image ( image );
image_put ( image );
}
/* Free temporary working space */
free ( tmp );
@ -1191,9 +1195,11 @@ int cms_decrypt ( struct cms_message *cms, struct image *image,
cipher_encrypt ( cipher, ctxdup, tmp, tmp, CMS_DECRYPT_BLKSZ );
copy_to_user ( image->data, offset, tmp, CMS_DECRYPT_BLKSZ );
}
image->flags = original_flags;
if ( original_flags & IMAGE_REGISTERED ) {
register_image ( image ); /* Cannot fail on re-registration */
image_put ( image );
}
image->flags = original_flags;
err_cipher:
free ( tmp );
err_alloc: