udf: Treat symlink component of type 2 as /

[Jan Kara]

From: Jan Kara <jack@xxxxxxx>

commit fef2e9f3301934773e4f1b3cc5c7bffb119346b8 upstream.

Currently, we ignore symlink component of type 2. But mkisofs and other OS'
seem to treat it as / so do the same for compatibility.

Reported-by: "Gábor S." <otnaccess@xxxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
[bwh: Needed for the following fix]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 fs/udf/symlink.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/udf/symlink.c b/fs/udf/symlink.c
index e28a902..2d60484 100644
--- a/fs/udf/symlink.c
+++ b/fs/udf/symlink.c
@@ -43,10 +43,16 @@ static void udf_pc_to_char(struct super_block *sb, char *from, int fromlen,
 		pc = (struct pathComponent *)(from + elen);
 		switch (pc->componentType) {
 		case 1:
-			if (pc->lengthComponentIdent == 0) {
-				p = to;
-				*p++ = '/';
-			}
+			/*
+			 * Symlink points to some place which should be agreed
+ 			 * upon between originator and receiver of the media. Ignore.
+			 */
+			if (pc->lengthComponentIdent > 0)
+				break;
+			/* Fall through */
+		case 2:
+			p = to;
+			*p++ = '/';
 			break;
 		case 3:
 			memcpy(p, "../", 3);
-- 
1.7.12.2.21.g234cd45.dirty


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