linux

iv/linux

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Sungjong Seo 9717df94d7 exfat: redefine DIR_DELETED as the bad cluster number

commit bdaadfd343 upstream.

When a file or a directory is deleted, the hint for the cluster of
its parent directory in its in-memory inode is set as DIR_DELETED.
Therefore, DIR_DELETED must be one of invalid cluster numbers. According
to the exFAT specification, a volume can have at most 2^32-11 clusters.
However, DIR_DELETED is wrongly defined as 0xFFFF0321, which could be
a valid cluster number. To fix it, let's redefine DIR_DELETED as
0xFFFFFFF7, the bad cluster number.

Fixes: 1acf1a564b ("exfat: add in-memory and on-disk structures and headers")
Cc: stable@vger.kernel.org # v5.7+
Reported-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-03-10 09:39:58 +01:00

balloc.c

exfat: check if cluster num is valid

2022-06-06 08:43:37 +02:00

cache.c

exfat: fix use of uninitialized spinlock on error path

2020-10-07 14:27:13 +09:00

dir.c

exfat: fix unexpected EOF while reading dir

2023-03-10 09:39:58 +01:00

exfat_fs.h

exfat: redefine DIR_DELETED as the bad cluster number