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udf: Fix uninitialized array access for some pathnames

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[ Upstream commit 028f6055c912588e6f72722d89c30b401bbcf013 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jan Kara 2023-06-21 11:32:35 +02:00 • committed by Greg Kroah-Hartman
commit 3f1368af47
1 changed files with 1 additions and 1 deletions
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2
fs/udf/unicode.c
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@ -247,7 +247,7 @@ 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) {