linux-ext4 - [PATCH v2 2/2] ext4: correct the judgment of BUG in ext4_mb_normalize

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220523141658.2919003-3-libaokun1@huawei.com>
Date:   Mon, 23 May 2022 22:16:58 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>,
        <ritesh.list@...il.com>, <lczerner@...hat.com>,
        <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>,
        <yebin10@...wei.com>, <yukuai3@...wei.com>, <libaokun1@...wei.com>
Subject: [PATCH v2 2/2] ext4: correct the judgment of BUG in ext4_mb_normalize_request

When either of the "start + size <= ac->ac_o_ex.fe_logical" or
"start > ac->ac_o_ex.fe_logical" conditions is met, it indicates
that the fe_logical is not in the allocated range.
In this case, it should be bug_ON.

Fixes: c9de560ded61 ("ext4: Add multi block allocator for ext4")
Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
V1->V2:
	Change Fixes from dfe076c106f6 to c9de560ded61.

 fs/ext4/mballoc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6aafc242fe23..61ced468f178 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4185,7 +4185,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
 	}
 	rcu_read_unlock();
 
-	if (start + size <= ac->ac_o_ex.fe_logical &&
+	if (start + size <= ac->ac_o_ex.fe_logical ||
 			start > ac->ac_o_ex.fe_logical) {
 		ext4_msg(ac->ac_sb, KERN_ERR,
 			 "start %lu, size %lu, fe_logical %lu",
-- 
2.31.1