linux-kernel - [PATCH] ocfs2: fix uninitialized variable in ocfs2_dio_wr_get

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Date:   Tue, 30 Nov 2021 13:40:43 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Mark Fasheh <mark@...heh.com>,
        Wengang Wang <wen.gang.wang@...cle.com>
Cc:     Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Sunil Mushran <sunil.mushran@...cle.com>,
        ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] ocfs2: fix uninitialized variable in ocfs2_dio_wr_get_block()

The callers assume that "*fsdata" is set on the success path, but
that's not necessarily true on this path.

Fixes: 5cffff9e2986 ("ocfs2: Fix ocfs2_page_mkwrite()")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
Please review this one EXTRA CAREFULLY.  It's from static analysis and
the truth is I'm not 100% sure it's correct.  I'm also not sure that
it's a complete fix.

Especially, please review how this is called from ocfs2_write_begin()
to make sure that this doesn't break anything.


 fs/ocfs2/aops.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 68d11c295dd3..a74a370f16f0 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1813,6 +1813,7 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
 	if (ret == -EAGAIN) {
 		BUG_ON(wc->w_target_page);
 		ret = 0;
+		*fsdata = wc;
 		goto out_quota;
 	}
 
-- 
2.20.1