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| author | Jan Kara <jack@suse.cz> | 2023-06-21 11:32:35 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2023-06-21 11:53:06 +0200 |
| commit | 028f6055c912588e6f72722d89c30b401bbcf013 (patch) | |
| tree | 752a307ccb52d3f6ecf370f21398c243edacac7f /fs/udf | |
| parent | 404615d7f1dcd4cca200e9a7a9df3a1dcae1dd62 (diff) | |
| download | linux-028f6055c912588e6f72722d89c30b401bbcf013.tar.gz linux-028f6055c912588e6f72722d89c30b401bbcf013.tar.bz2 linux-028f6055c912588e6f72722d89c30b401bbcf013.zip | |
udf: Fix uninitialized array access for some pathnames
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>
Diffstat (limited to 'fs/udf')
| -rw-r--r-- | fs/udf/unicode.c | 2 |
1 files changed, 1 insertions, 1 deletions
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) { |