From b54e41f5efcb4316b2f30b30c2535cc194270373 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Fri, 16 Nov 2018 13:43:17 +0100
Subject: [PATCH] udf: Allow mounting volumes with incorrect identification
 strings
Git-commit: b54e41f5efcb4316b2f30b30c2535cc194270373
Patch-mainline: v4.20-rc5
References: bsc#1118774

Commit c26f6c615788 ("udf: Fix conversion of 'dstring' fields to UTF8")
started to be more strict when checking whether converted strings are
properly formatted. Sudip reports that there are DVDs where the volume
identification string is actually too long - UDF reports:

[  632.309320] UDF-fs: incorrect dstring lengths (32/32)

during mount and fails the mount. This is mostly harmless failure as we
don't need volume identification (and even less volume set
identification) for anything. So just truncate the volume identification
string if it is too long and replace it with 'Invalid' if we just cannot
convert it for other reasons. This keeps slightly incorrect media still
mountable.

Cc: stable@vger.kernel.org
Fixes: c26f6c615788 ("udf: Fix conversion of 'dstring' fields to UTF8")
Reported-and-tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/udf/super.c   |   16 ++++++++++------
 fs/udf/unicode.c |   14 +++++++++++---
 2 files changed, 21 insertions(+), 9 deletions(-)

--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -926,16 +926,20 @@ static int udf_load_pvoldesc(struct supe
 	}
 
 	ret = udf_dstrCS0toUTF8(outstr, 31, pvoldesc->volIdent, 32);
-	if (ret < 0)
-		goto out_bh;
-
-	strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
+	if (ret < 0) {
+		strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
+		pr_warn("incorrect volume identification, setting to "
+			"'InvalidName'\n");
+	} else {
+		strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
+	}
 	udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
 
 	ret = udf_dstrCS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128);
-	if (ret < 0)
+	if (ret < 0) {
+		ret = 0;
 		goto out_bh;
-
+	}
 	outstr[ret] = 0;
 	udf_debug("volSetIdent[] = '%s'\n", outstr);
 
--- a/fs/udf/unicode.c
+++ b/fs/udf/unicode.c
@@ -341,6 +341,11 @@ try_again:
 	return u_len;
 }
 
+/*
+ * Convert CS0 dstring to utf8. Warning: This function may truncate input
+ * string if it is too long as it is used for informational strings only and it
+ * is better to truncate the string than to refuse mounting a media.
+ */
 int udf_dstrCS0toUTF8(uint8_t *utf_o, int o_len,
 		      const uint8_t *ocu_i, int i_len)
 {
@@ -349,9 +354,12 @@ int udf_dstrCS0toUTF8(uint8_t *utf_o, in
 	if (i_len > 0) {
 		s_len = ocu_i[i_len - 1];
 		if (s_len >= i_len) {
-			pr_err("incorrect dstring lengths (%d/%d)\n",
-			       s_len, i_len);
-			return -EINVAL;
+			pr_warn("incorrect dstring lengths (%d/%d),"
+				" truncating\n", s_len, i_len);
+			s_len = i_len - 1;
+			/* 2-byte encoding? Need to round properly... */
+			if (ocu_i[0] == 16)
+				s_len -= (s_len - 1) & 2;
 		}
 	}