6.1-stable review patch. If anyone has any objections, please let me know.
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From: Hobin Woo hobin.woo@samsung.com
[ 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@samsung.com Reviewed-by: Sungjong Seo sj1557.seo@samsung.com Reviewed-by: Namjae Jeon linkinjeon@kernel.org Tested-by: Yoonho Shin yoonho.shin@samsung.com Acked-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/server/smb2pdu.c | 12 +++++++++++- fs/smb/server/vfs.h | 1 + 2 files changed, 12 insertions(+), 1 deletion(-)
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;