linux-kernel - [PATCH v2] xfs: scrub: avoid uninitialized return code

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Message-ID: <20171102195306.GA4911@magnolia>
Date:   Thu, 2 Nov 2017 12:53:06 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-xfs@...r.kernel.org, Dave Chinner <dchinner@...hat.com>,
        linux-kernel@...r.kernel.org, Brian Foster <bfoster@...hat.com>
Subject: [PATCH v2] xfs: scrub: avoid uninitialized return code

From: Darrick J. Wong <darrick.wong@...cle.com>

The newly added xfs_scrub_da_btree_block() function has one code path
that returns the 'error' variable without initializing it first, as
shown by this compiler warning:

fs/xfs/scrub/dabtree.c: In function 'xfs_scrub_da_btree_block':
fs/xfs/scrub/dabtree.c:462:9: error: 'error' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Return zero since the caller will exit the scrub code if we don't produce a
buffer pointer.

Fixes: 7c4a07a424c1 ("xfs: scrub directory/attribute btrees")
Reported-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/xfs/scrub/dabtree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/scrub/dabtree.c b/fs/xfs/scrub/dabtree.c
index c21c528..4c9839c 100644
--- a/fs/xfs/scrub/dabtree.c
+++ b/fs/xfs/scrub/dabtree.c
@@ -336,7 +336,7 @@ xfs_scrub_da_btree_block(
 	xfs_ino_t			owner;
 	int				*pmaxrecs;
 	struct xfs_da3_icnode_hdr	nodehdr;
-	int				error;
+	int				error = 0;
 
 	blk = &ds->state->path.blk[level];
 	ds->state->path.active = level + 1;