linux-kernel - [PATCH v2] proc/vmcore: fix potential memory leak in vmcore

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Message-Id: <20220914013310.6386-1-niejianglei2021@163.com>
Date:   Wed, 14 Sep 2022 09:33:10 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     bhe@...hat.com, vgoyal@...hat.com, dyoung@...hat.com
Cc:     kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH v2] proc/vmcore: fix potential memory leak in vmcore_init()

elfcorehdr_alloc() allocates a memory chunk for elfcorehdr_addr with
kzalloc(). If is_vmcore_usable() returns false, elfcorehdr_addr is a
predefined value. If parse_crash_elf_headers() gets some error and
returns a negetive value, the elfcorehdr_addr should be released with
elfcorehdr_free().

Fix it by calling elfcorehdr_free() when parse_crash_elf_headers() fails.

Acked-by: Baoquan He <bhe@...hat.com>
Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 fs/proc/vmcore.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index f2aa86c421f2..74747571d58e 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -1567,6 +1567,7 @@ static int __init vmcore_init(void)
 		return rc;
 	rc = parse_crash_elf_headers();
 	if (rc) {
+		elfcorehdr_free(elfcorehdr_addr);
 		pr_warn("Kdump: vmcore not initialized\n");
 		return rc;
 	}
-- 
2.25.1