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 PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 21 Oct 2020 17:15:28 +0800 From: Chunguang Xu <brookxu.cn@...il.com> To: tytso@....edu, adilger.kernel@...ger.ca Cc: linux-ext4@...r.kernel.org Subject: [PATCH 8/8] ext4: fix a memory leak of ext4_free_data From: Chunguang Xu <brookxu@...cent.com> When freeing metadata, we will create an ext4_free_data and insert it into the pending free list. After the current transaction is committed, the object will be freed. ext4_mb_free_metadata() will check whether the area to be freed overlaps with the pending free list. If true, return directly. At this time, ext4_free_data is leaked. Fortunately, the probability of this problem is relatively small, maybe we should fix this problem. Signed-off-by: Chunguang Xu <brookxu@...cent.com> --- fs/ext4/mballoc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 2b1bc6c..3af4903 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -5146,6 +5146,7 @@ int ext4_metadata_block_overlaps(struct super_block *sb, ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, cluster), "Block already on to-be-freed list"); + kmem_cache_free(ext4_free_data_cachep, new_entry); return 0; } } -- 1.8.3.1
Powered by blists - more mailing lists