From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Date: Sun, 10 Feb 2008 06:07:28 +0000 (-0500)
Subject: ext4: Fix null bh pointer dereference in mballoc
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=42a10add852e6291a7544afd8a286622a3e6ae76;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ext4: Fix null bh pointer dereference in mballoc

Repoted by Adrian Bunk <bunk@kernel.org>:

The Coverity checker spotted the following NULL dereference:

static int ext4_mb_mark_diskspace_used
{
	...
	if (!bitmap_bh)
		goto out_err;
	...
out_err:
	sb->s_dirt = 1;
	put_bh(bitmap_bh);
	...

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
---

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 76e5fedc0a0b..06d1f5292d3a 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3069,7 +3069,7 @@ static int ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
 
 out_err:
 	sb->s_dirt = 1;
-	put_bh(bitmap_bh);
+	brelse(bitmap_bh);
 	return err;
 }