From 028f6055c912588e6f72722d89c30b401bbcf013 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Wed, 21 Jun 2023 11:32:35 +0200
Subject: [PATCH] udf: Fix uninitialized array access for some pathnames
Git-commit: 028f6055c912588e6f72722d89c30b401bbcf013
Patch-mainline: v6.5-rc1
References: bsc#1214967
For filenames that begin with . and are between 2 and 5 characters long,
UDF charset conversion code would read uninitialized memory in the
output buffer. The only practical impact is that the name may be prepended a
"unification hash" when it is not actually needed but still it is good
to fix this.
Reported-by: syzbot+cd311b1e43cc25f90d18@syzkaller.appspotmail.com
Link: https://lore.kernel.org/all/000000000000e2638a05fe9dc8f9@google.com
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Jan Kara <jack@suse.cz>
---
fs/udf/unicode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
index ae6e809fa3aa..32c7f3d27f74 100644
--- a/fs/udf/unicode.c
+++ b/fs/udf/unicode.c
@@ -243,7 +243,7 @@ static int udf_name_from_CS0(struct super_block *sb,
}
if (translate) {
- if (str_o_len <= 2 && str_o[0] == '.' &&
+ if (str_o_len > 0 && str_o_len <= 2 && str_o[0] == '.' &&
(str_o_len == 1 || str_o[1] == '.'))
needsCRC = 1;
if (needsCRC) {
--
2.35.3