linux-kernel - [PATCH 5.12 119/161] ext4: fix memory leak in ext4_mb_init

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Date:   Tue,  8 Jun 2021 20:27:29 +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,
        syzbot+aa12d6106ea4ca1b6aae@...kaller.appspotmail.com,
        Phillip Potter <phil@...lpotter.co.uk>, stable@...nel.org,
        Theodore Tso <tytso@....edu>
Subject: [PATCH 5.12 119/161] ext4: fix memory leak in ext4_mb_init_backend on error path.

From: Phillip Potter <phil@...lpotter.co.uk>

commit a8867f4e3809050571c98de7a2d465aff5e4daf5 upstream.

Fix a memory leak discovered by syzbot when a file system is corrupted
with an illegally large s_log_groups_per_flex.

Reported-by: syzbot+aa12d6106ea4ca1b6aae@...kaller.appspotmail.com
Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
Cc: stable@...nel.org
Link: https://lore.kernel.org/r/20210412073837.1686-1-phil@philpotter.co.uk
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ext4/mballoc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2715,7 +2715,7 @@ static int ext4_mb_init_backend(struct s
 		 */
 		if (sbi->s_es->s_log_groups_per_flex >= 32) {
 			ext4_msg(sb, KERN_ERR, "too many log groups per flexible block group");
-			goto err_freesgi;
+			goto err_freebuddy;
 		}
 		sbi->s_mb_prefetch = min_t(uint, 1 << sbi->s_es->s_log_groups_per_flex,
 			BLK_MAX_SEGMENT_SIZE >> (sb->s_blocksize_bits - 9));