linux-kernel - [PATCH 3.16 150/305] ext4: avoid possible double brelse() in add_new

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Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Vasily Averin" <vvs@...tuozzo.com>,
        "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 3.16 150/305] ext4: avoid possible double brelse() in
 add_new_gdb() on error path

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Theodore Ts'o <tytso@....edu>

commit 4f32c38b4662312dd3c5f113d8bdd459887fb773 upstream.

Fixes: b40971426a83 ("ext4: add error checking to calls to ...")
Reported-by: Vasily Averin <vvs@...tuozzo.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/ext4/resize.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -845,6 +845,7 @@ static int add_new_gdb(handle_t *handle,
 	err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
 	if (unlikely(err)) {
 		ext4_std_error(sb, err);
+		iloc.bh = NULL;
 		goto exit_inode;
 	}
 	brelse(dind);