linux-kernel - [PATCH] ocfs2: quota_local: fix possible uninitialized-variable access in ocfs2_local_read

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Message-Id: <20210731075659.73505-1-islituo@gmail.com>
Date:   Sat, 31 Jul 2021 00:56:59 -0700
From:   Tuo Li <islituo@...il.com>
To:     mark@...heh.com, jlbec@...lplan.org, joseph.qi@...ux.alibaba.com
Cc:     ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org,
        baijiaju1990@...il.com, Tuo Li <islituo@...il.com>,
        TOTE Robot <oslab@...nghua.edu.cn>
Subject: [PATCH] ocfs2: quota_local: fix possible uninitialized-variable access in ocfs2_local_read_info()

A memory block is allocated through kmalloc(), and its return value is
assigned to the pointer oinfo. If the return value of
ocfs2_global_read_info() at line 709 is less than zero,
oinfo->dqi_gqinode may be not initialized. However, it is accessed at
line 775:
  iput(oinfo->dqi_gqinode);

To fix this possible uninitialized-variable access, replace kmalloc()
with kzalloc() when allocating memory for oinfo.

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Tuo Li <islituo@...il.com>
---
 fs/ocfs2/quota_local.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index b1a8b046f4c2..4c1219e08b49 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -693,7 +693,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
 
 	info->dqi_max_spc_limit = 0x7fffffffffffffffLL;
 	info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
-	oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
+	oinfo = kzalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 	if (!oinfo) {
 		mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 			       " info.");
-- 
2.25.1