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linux/fs/exfat
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Namjae Jeon d84150aab3 exfat: fix uninit-value in __exfat_get_dentry_set 
commit 02dffe9ab0 upstream.

There is no check if stream size and start_clu are invalid.
If start_clu is EOF cluster and stream size is 4096, It will
cause uninit value access. because ei->hint_femp.eidx could
be 128(if cluster size is 4K) and wrong hint will allocate
next cluster. and this cluster will be same with the cluster
that is allocated by exfat_extend_valid_size(). The previous
patch will check invalid start_clu, but for clarity, initialize
hint_femp.eidx to zero.

Cc: stable@vger.kernel.org
Reported-by: syzbot+01218003be74b5e1213a@syzkaller.appspotmail.com
Tested-by: syzbot+01218003be74b5e1213a@syzkaller.appspotmail.com
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-14 19:54:00 +01:00
..
balloc.c exfat: fix memory leak in exfat_load_bitmap() 2024-10-17 15:21:57 +02:00
cache.c exfat: fix use of uninitialized spinlock on error path 2020-10-07 14:27:13 +09:00
dir.c exfat: check if filename entries exceeds max filename length 2023-08-11 12:08:26 +02:00
exfat_fs.h exfat: redefine DIR_DELETED as the bad cluster number 2023-03-10 09:34:08 +01:00
exfat_raw.h exfat: fix shift-out-of-bounds in exfat_fill_super() 2021-02-22 09:55:13 +09:00
fatent.c exfat: fix overflow for large capacity partition 2022-09-04 09:38:40 +09:00
file.c exfat: fix inode->i_blocks for non-512 byte sector size device 2023-03-10 09:34:08 +01:00
inode.c exfat: fix inode->i_blocks for non-512 byte sector size device 2023-03-10 09:34:08 +01:00
Kconfig exfat: Improve wording of EXFAT_DEFAULT_IOCHARSET config option 2020-06-09 16:48:39 +09:00
Makefile exfat: add Kconfig and Makefile 2020-03-05 21:00:40 -05:00
misc.c exfat: Expand exfat_err() and co directly to pr_*() macro 2022-08-01 10:14:07 +09:00
namei.c exfat: fix uninit-value in __exfat_get_dentry_set 2024-12-14 19:54:00 +01:00
nls.c exfat: Drop superfluous new line for error messages 2022-08-01 10:14:07 +09:00
super.c exfat: fix inode->i_blocks for non-512 byte sector size device 2023-03-10 09:34:08 +01:00