linux-kernel - [PATCH 3.16 118/134] target/fileio: Fix zero-length READ and WRITE handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <lsq.1503062000.143255356@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Bart Van Assche" <bart.vanassche@...disk.com>,
        "Christoph Hellwig" <hch@....de>,
        "Nicholas Bellinger" <nab@...ux-iscsi.org>,
        "Andy Grover" <agrover@...hat.com>,
        "David Disseldorp" <ddiss@...e.de>,
        "Hannes Reinecke" <hare@...e.com>
Subject: [PATCH 3.16 118/134] target/fileio: Fix zero-length READ and
 WRITE handling

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@...disk.com>

commit 59ac9c078141b8fd0186c0b18660a1b2c24e724e upstream.

This patch fixes zero-length READ and WRITE handling in target/FILEIO,
which was broken a long time back by:

Since:

  commit d81cb44726f050d7cf1be4afd9cb45d153b52066
  Author: Paolo Bonzini <pbonzini@...hat.com>
  Date:   Mon Sep 17 16:36:11 2012 -0700

      target: go through normal processing for all zero-length commands

which moved zero-length READ and WRITE completion out of target-core,
to doing submission into backend driver code.

To address this, go ahead and invoke target_complete_cmd() for any
non negative return value in fd_do_rw().

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Cc: Andy Grover <agrover@...hat.com>
Cc: David Disseldorp <ddiss@...e.de>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/target_core_file.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -743,8 +743,7 @@ fd_execute_rw(struct se_cmd *cmd, struct
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 	}
 
-	if (ret)
-		target_complete_cmd(cmd, SAM_STAT_GOOD);
+	target_complete_cmd(cmd, SAM_STAT_GOOD);
 	return 0;
 }