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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/lib/sg_split.c
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@@ -1,10 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2015 Robert Jarzmik <robert.jarzmik@free.fr>
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  *
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  * Scatterlist splitting helpers.
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- *
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- * This source code is licensed under the GNU General Public License,
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- * Version 2. See the file COPYING for more details.
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  */
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 #include <linux/scatterlist.h>
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@@ -178,11 +176,13 @@
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 	 * The order of these 3 calls is important and should be kept.
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 	 */
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 	sg_split_phys(splitters, nb_splits);
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-	ret = sg_calculate_split(in, in_mapped_nents, nb_splits, skip,
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-				 split_sizes, splitters, true);
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-	if (ret < 0)
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-		goto err;
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-	sg_split_mapped(splitters, nb_splits);
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+	if (in_mapped_nents) {
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+		ret = sg_calculate_split(in, in_mapped_nents, nb_splits, skip,
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+					 split_sizes, splitters, true);
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+		if (ret < 0)
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+			goto err;
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+		sg_split_mapped(splitters, nb_splits);
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+	}
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 	for (i = 0; i < nb_splits; i++) {
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 		out[i] = splitters[i].out_sg;