linux-kernel - [PATCH 5.4 068/102] CIFS: fiemap: do not return EINVAL if get nothing

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Date:   Tue, 24 Mar 2020 14:11:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Murphy Zhou <jencce.kernel@...il.com>,
        Steve French <stfrench@...rosoft.com>,
        Pavel Shilovsky <pshilov@...rosoft.com>
Subject: [PATCH 5.4 068/102] CIFS: fiemap: do not return EINVAL if get nothing

From: Murphy Zhou <jencce.kernel@...il.com>

commit 979a2665eb6c603ddce0ab374041ab101827b2e7 upstream.

If we call fiemap on a truncated file with none blocks allocated,
it makes sense we get nothing from this call. No output means
no blocks have been counted, but the call succeeded. It's a valid
response.

Simple example reproducer:
xfs_io -f 'truncate 2M' -c 'fiemap -v' /cifssch/testfile
xfs_io: ioctl(FS_IOC_FIEMAP) ["/cifssch/testfile"]: Invalid argument

Signed-off-by: Murphy Zhou <jencce.kernel@...il.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@...rosoft.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2ops.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3252,7 +3252,7 @@ static int smb3_fiemap(struct cifs_tcon
 	if (rc)
 		goto out;
 
-	if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
+	if (out_data_len && out_data_len < sizeof(struct file_allocated_range_buffer)) {
 		rc = -EINVAL;
 		goto out;
 	}