linux-kernel - [PATCH 4.17 16/18] xfs: dont call xfs_da_shrink

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Message-Id: <20180807172313.567799292@linuxfoundation.org>
Date:   Tue,  7 Aug 2018 20:51:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Xu, Wen" <wen.xu@...ech.edu>,
        Eric Sandeen <sandeen@...hat.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Eduardo Valentin <eduval@...zon.com>
Subject: [PATCH 4.17 16/18] xfs: dont call xfs_da_shrink_inode with NULL bp

4.17-stable review patch.  If anyone has any objections, please let me know.

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

From: Eric Sandeen <sandeen@...deen.net>

commit bb3d48dcf86a97dc25fe9fc2c11938e19cb4399a upstream.

xfs_attr3_leaf_create may have errored out before instantiating a buffer,
for example if the blkno is out of range.  In that case there is no work
to do to remove it, and in fact xfs_da_shrink_inode will lead to an oops
if we try.

This also seems to fix a flaw where the original error from
xfs_attr3_leaf_create gets overwritten in the cleanup case, and it
removes a pointless assignment to bp which isn't used after this.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199969
Reported-by: Xu, Wen <wen.xu@...ech.edu>
Tested-by: Xu, Wen <wen.xu@...ech.edu>
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Cc: Eduardo Valentin <eduval@...zon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/xfs/libxfs/xfs_attr_leaf.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -803,9 +803,8 @@ xfs_attr_shortform_to_leaf(
 	ASSERT(blkno == 0);
 	error = xfs_attr3_leaf_create(args, blkno, &bp);
 	if (error) {
-		error = xfs_da_shrink_inode(args, 0, bp);
-		bp = NULL;
-		if (error)
+		/* xfs_attr3_leaf_create may not have instantiated a block */
+		if (bp && (xfs_da_shrink_inode(args, 0, bp) != 0))
 			goto out;
 		xfs_idata_realloc(dp, size, XFS_ATTR_FORK);	/* try to put */
 		memcpy(ifp->if_u1.if_data, tmpbuffer, size);	/* it back */