+ proc-vmcore-fix-potential-memory-leak-in-vmcore_init.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: proc/vmcore: fix potential memory leak in vmcore_init()
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     proc-vmcore-fix-potential-memory-leak-in-vmcore_init.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/proc-vmcore-fix-potential-memory-leak-in-vmcore_init.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Jianglei Nie <niejianglei2021@163.com>
Subject: proc/vmcore: fix potential memory leak in vmcore_init()
Date: Mon, 4 Jul 2022 16:18:39 +0800

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() occurs some error and
returns a negative value, the elfcorehdr_addr should be released with
elfcorehdr_free().

We can fix by calling elfcorehdr_free() when parse_crash_elf_headers()
fails.

Link: https://lkml.kernel.org/r/20220704081839.2232996-1-niejianglei2021@163.com
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/proc/vmcore.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/proc/vmcore.c~proc-vmcore-fix-potential-memory-leak-in-vmcore_init
+++ a/fs/proc/vmcore.c
@@ -1568,7 +1568,7 @@ static int __init vmcore_init(void)
 	rc = parse_crash_elf_headers();
 	if (rc) {
 		pr_warn("Kdump: vmcore not initialized\n");
-		return rc;
+		goto fail;
 	}
 	elfcorehdr_free(elfcorehdr_addr);
 	elfcorehdr_addr = ELFCORE_ADDR_ERR;
@@ -1576,6 +1576,9 @@ static int __init vmcore_init(void)
 	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &vmcore_proc_ops);
 	if (proc_vmcore)
 		proc_vmcore->size = vmcore_size;
+
+fail:
+	elfcorehdr_free(elfcorehdr_addr);
 	return 0;
 }
 fs_initcall(vmcore_init);
_

Patches currently in -mm which might be from niejianglei2021@163.com are

proc-vmcore-fix-potential-memory-leak-in-vmcore_init.patch