[PATCH 5.10 266/663] quota: Fix memory leak when handling corrupted quota file
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-03-02 00:03:48
Also in:
lkml
Subsystem:
diskquota, filesystems (vfs and infrastructure), the rest · Maintainers:
Jan Kara, Alexander Viro, Christian Brauner, Linus Torvalds
From: Jan Kara <jack@suse.cz>
[ Upstream commit a4db1072e1a3bd7a8d9c356e1902b13ac5deb8ef ]
When checking corrupted quota file we can bail out and leak allocated
info structure. Properly free info structure on error return.
Reported-by: syzbot+77779c9b52ab78154b08@syzkaller.appspotmail.com
Fixes: 11c514a99bb9 ("quota: Sanity-check quota file headers on load")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/quota/quota_v2.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index c21106557a37e..b1467f3921c28 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c@@ -164,19 +164,24 @@ static int v2_read_file_info(struct super_block *sb, int type) quota_error(sb, "Number of blocks too big for quota file size (%llu > %llu).", (loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits, i_size_read(sb_dqopt(sb)->files[type])); - goto out; + goto out_free; } if (qinfo->dqi_free_blk >= qinfo->dqi_blocks) { quota_error(sb, "Free block number too big (%u >= %u).", qinfo->dqi_free_blk, qinfo->dqi_blocks); - goto out; + goto out_free; } if (qinfo->dqi_free_entry >= qinfo->dqi_blocks) { quota_error(sb, "Block with free entry too big (%u >= %u).", qinfo->dqi_free_entry, qinfo->dqi_blocks); - goto out; + goto out_free; } ret = 0; +out_free: + if (ret) { + kfree(info->dqi_priv); + info->dqi_priv = NULL; + } out: up_read(&dqopt->dqio_sem); return ret;
--
2.27.0