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exfat: fix exfat_find_empty_entry() not returning error on failure

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On failure, "dentry" is the error code. If the error code indicates
that there is no space, a new cluster may need to be allocated; for
other errors, it should be returned directly.

Only on success, "dentry" is the index of the directory entry, and
it needs to be converted into the directory entry index within the
cluster where it is located.

Fixes: 8a3f5711ad ("exfat: reduce FAT chain traversal")
Reported-by: syzbot+6f6c9397e0078ef60bce@syzkaller.appspotmail.com
Tested-by: syzbot+6f6c9397e0078ef60bce@syzkaller.appspotmail.com
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Yuezhang Mo 2024-12-02 09:53:17 +08:00 committed by Namjae Jeon
parent feffde684a
commit 70465acbb0
1 changed files with 2 additions and 2 deletions
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4
fs/exfat/namei.c
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@ -330,8 +330,8 @@ static int exfat_find_empty_entry(struct inode *inode,
while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
num_entries, es)) < 0) {
if (dentry == -EIO)
break;
if (dentry != -ENOSPC)
return dentry;
if (exfat_check_max_dentries(inode))
return -ENOSPC;