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exfat: redefine DIR_DELETED as the bad cluster number

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commit bdaadfd343e3cba49ad0b009ff4b148dad0fa404 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: 1acf1a564b60 ("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>
This commit is contained in:
Sungjong Seo 2022-12-29 20:52:38 +09:00 committed by Greg Kroah-Hartman
parent c2c3d86bd4
commit 9717df94d7
1 changed files with 1 additions and 1 deletions
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2
fs/exfat/exfat_fs.h
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@ -42,7 +42,7 @@ enum {
#define ES_2_ENTRIES 2
#define ES_ALL_ENTRIES 0
#define DIR_DELETED 0xFFFF0321
#define DIR_DELETED 0xFFFFFFF7
/* type values */
#define TYPE_UNUSED 0x0000