linux-kernel - [PATCH 3.4 041/172] sg: fix read() error reporting

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Message-Id: <1434443826-4929-41-git-send-email-lizf@kernel.org>
Date:	Tue, 16 Jun 2015 16:34:55 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Tony Battersby <tonyb@...ernetics.com>,
	James Bottomley <JBottomley@...allels.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 041/172] sg: fix read() error reporting

From: Tony Battersby <tonyb@...ernetics.com>

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

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


commit 3b524a683af8991b4eab4182b947c65f0ce1421b upstream.

Fix SCSI generic read() incorrectly returning success after detecting an
error.

Signed-off-by: Tony Battersby <tonyb@...ernetics.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/scsi/sg.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index eacd46b..fb119ce 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -498,7 +498,7 @@ static ssize_t
 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
 {
 	sg_io_hdr_t *hp = &srp->header;
-	int err = 0;
+	int err = 0, err2;
 	int len;
 
 	if (count < SZ_SG_IO_HDR) {
@@ -527,8 +527,8 @@ sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
 		goto err_out;
 	}
 err_out:
-	err = sg_finish_rem_req(srp);
-	return (0 == err) ? count : err;
+	err2 = sg_finish_rem_req(srp);
+	return err ? : err2 ? : count;
 }
 
 static ssize_t
-- 
1.9.1

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