linux-kernel - [PATCH][xfs-next] xfs: fix uninitialized error variable

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Date:   Thu, 21 Feb 2019 11:22:24 +0000
From:   Colin King <colin.king@...onical.com>
To:     "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Brian Foster <bfoster@...hat.com>,
        Dave Chinner <dchinner@...hat.com>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][xfs-next] xfs: fix uninitialized error variable

From: Colin Ian King <colin.king@...onical.com>

A previous commit removed the initialization of variable 'error' to zero,
and can cause a bogus error return.  This occurs when error contains a
non-zero garbage value and the call to xchk_should_terminate detects a
pending fatal signal and checks for a zero error before setting it
to -EAGAIN. Fix the issue by initializing error to zero.

Fixes: b9454fe056bd ("xfs: clean up the inode cluster checking in the inobt scrub")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/xfs/scrub/ialloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
index 2c9dad2b61b1..700114f79a7d 100644
--- a/fs/xfs/scrub/ialloc.c
+++ b/fs/xfs/scrub/ialloc.c
@@ -161,7 +161,7 @@ xchk_iallocbt_check_cluster_ifree(
 	bool				irec_free;
 	bool				ino_inuse;
 	bool				freemask_ok;
-	int				error;
+	int				error = 0;
 
 	if (xchk_should_terminate(bs->sc, &error))
 		return error;
-- 
2.20.1