This is a note to let you know that I've just added the patch titled
ksmbd: retry iterate_dir in smb2_query_dir
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ksmbd-retry-iterate_dir-in-smb2_query_dir.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 22f48894c84e685a635947acdc1ce9bdb86f185e
Author: Hobin Woo <hobin.woo@xxxxxxxxxxx>
Date: Thu Dec 5 11:31:19 2024 +0900
ksmbd: retry iterate_dir in smb2_query_dir
[ Upstream commit 2b904d61a97e8ba79e3bc216ba290fd7e1d85028 ]
Some file systems do not ensure that the single call of iterate_dir
reaches the end of the directory. For example, FUSE fetches entries from
a daemon using 4KB buffer and stops fetching if entries exceed the
buffer. And then an actor of caller, KSMBD, is used to fill the entries
from the buffer.
Thus, pattern searching on FUSE, files located after the 4KB could not
be found and STATUS_NO_SUCH_FILE was returned.
Signed-off-by: Hobin Woo <hobin.woo@xxxxxxxxxxx>
Reviewed-by: Sungjong Seo <sj1557.seo@xxxxxxxxxxx>
Reviewed-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Tested-by: Yoonho Shin <yoonho.shin@xxxxxxxxxxx>
Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 96d441ca511d..71478a590e83 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -3988,6 +3988,7 @@ static bool __query_dir(struct dir_context *ctx, const char *name, int namlen,
/* dot and dotdot entries are already reserved */
if (!strcmp(".", name) || !strcmp("..", name))
return true;
+ d_info->num_scan++;
if (ksmbd_share_veto_filename(priv->work->tcon->share_conf, name))
return true;
if (!match_pattern(name, namlen, priv->search_pattern))
@@ -4148,8 +4149,17 @@ int smb2_query_dir(struct ksmbd_work *work)
query_dir_private.info_level = req->FileInformationClass;
dir_fp->readdir_data.private = &query_dir_private;
set_ctx_actor(&dir_fp->readdir_data.ctx, __query_dir);
-
+again:
+ d_info.num_scan = 0;
rc = iterate_dir(dir_fp->filp, &dir_fp->readdir_data.ctx);
+ /*
+ * num_entry can be 0 if the directory iteration stops before reaching
+ * the end of the directory and no file is matched with the search
+ * pattern.
+ */
+ if (rc >= 0 && !d_info.num_entry && d_info.num_scan &&
+ d_info.out_buf_len > 0)
+ goto again;
/*
* req->OutputBufferLength is too small to contain even one entry.
* In this case, it immediately returns OutputBufferLength 0 to client.
diff --git a/fs/smb/server/vfs.h b/fs/smb/server/vfs.h
index e761dde2443e..cc47e71c4de1 100644
--- a/fs/smb/server/vfs.h
+++ b/fs/smb/server/vfs.h
@@ -43,6 +43,7 @@ struct ksmbd_dir_info {
char *rptr;
int name_len;
int out_buf_len;
+ int num_scan;
int num_entry;
int data_count;
int last_entry_offset;
