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cifs: set rc to -ENOENT if we can not get a dentry for the cached dir

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We already set rc to this return code further down in the function but
we can set it earlier in order to suppress a smash warning.

Also fix a false positive for Coverity. The reason this is a false positive is
that this happens during umount after all files and directories have been closed
but mosetting on ->on_list to suppress the warning.

Reported-by: Dan carpenter <dan.carpenter@oracle.com>
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1525256 ("Concurrent data access violations")
Fixes: a350d6e73f5e ("cifs: enable caching of directories for which a lease is held")
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2022-10-17 18:48:26 -05:00 committed by Steve French
parent d32f211adb
commit 053569ccde
1 changed files with 4 additions and 2 deletions
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6
fs/cifs/cached_dir.c
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@ -253,8 +253,10 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
dentry = dget(cifs_sb->root);
else {
dentry = path_to_dentry(cifs_sb, path);
if (IS_ERR(dentry))
if (IS_ERR(dentry)) {
rc = -ENOENT;
goto oshr_free;
}
}
cfid->dentry = dentry;
cfid->tcon = tcon;
@ -385,13 +387,13 @@ void invalidate_all_cached_dirs(struct cifs_tcon *tcon)
list_move(&cfid->entry, &entry);
cfids->num_entries--;
cfid->is_open = false;
cfid->on_list = false;
/* To prevent race with smb2_cached_lease_break() */
kref_get(&cfid->refcount);
}
spin_unlock(&cfids->cfid_list_lock);
list_for_each_entry_safe(cfid, q, &entry, entry) {
cfid->on_list = false;
list_del(&cfid->entry);
cancel_work_sync(&cfid->lease_break);
if (cfid->has_lease) {