linux-ext4 - [PATCH v2 5/6] e2fsck: check whether ldesc is null before accessing, it in end_problem

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Message-ID: <9a9c6658-a8b3-794a-85df-c3bdf0470111@huawei.com>
Date:   Fri, 31 Dec 2021 15:43:10 +0800
From:   zhanchengbin <zhanchengbin1@...wei.com>
To:     Theodore Ts'o <tytso@....edu>
CC:     <linux-ext4@...r.kernel.org>, <liuzhiqiang26@...wei.com>,
        <linfeilong@...wei.com>, <wubo40@...wei.com>
Subject: [PATCH v2 5/6] e2fsck: check whether ldesc is null before accessing,
 it in end_problem_latch()

In end_problem_latch(), ldesc need check not NULL before dereference.

Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
---
  e2fsck/problem.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index f454dcb7..fd814f9e 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -2394,6 +2394,8 @@ int end_problem_latch(e2fsck_t ctx, int mask)
  	int answer = -1;

  	ldesc = find_latch(mask);
+	if (!ldesc)
+		return answer;
  	if (ldesc->end_message && (ldesc->flags & PRL_LATCHED)) {
  		clear_problem_context(&pctx);
  		answer = fix_problem(ctx, ldesc->end_message, &pctx);
-- 
2.27.0