linux-kernel - [PATCH 1/2] staging: lustre: lov: fix dereference of ERR

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Message-Id: <1441729382-27865-1-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Tue,  8 Sep 2015 21:53:01 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, HPDD-discuss@...ts.01.org,
	devel@...verdev.osuosl.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 1/2] staging: lustre: lov: fix dereference of ERR_PTR

If lov_sub_get() fails then it returns the error code in ERR_PTR, but
here we were dereferencing sub without checking if lov_sub_get() has
actually succeeded or not. And on error we can directly return the error
code from lov_io_fault_start() as it return 0 on success and the error
code on error.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/staging/lustre/lustre/lov/lov_io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/lustre/lustre/lov/lov_io.c b/drivers/staging/lustre/lustre/lov/lov_io.c
index bf36291..b5b2580 100644
--- a/drivers/staging/lustre/lustre/lov/lov_io.c
+++ b/drivers/staging/lustre/lustre/lov/lov_io.c
@@ -729,6 +729,8 @@ static int lov_io_fault_start(const struct lu_env *env,
 	fio = &ios->cis_io->u.ci_fault;
 	lio = cl2lov_io(env, ios);
 	sub = lov_sub_get(env, lio, lov_page_stripe(fio->ft_page));
+	if (IS_ERR(sub))
+		return PTR_ERR(sub);
 	sub->sub_io->u.ci_fault.ft_nob = fio->ft_nob;
 	lov_sub_put(sub);
 	return lov_io_start(env, ios);
-- 
1.9.1

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