From 22124c9999f00340b062fff740db30187bf18454 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Fernando=20Luis=20V=C3=A1zquez=20Cao?=
 <fernando@oss.ntt.co.jp>
Date: Thu, 18 Oct 2007 23:39:14 -0700
Subject: [PATCH] kmap leak fix for x86_32 kdump
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copy_oldmem_page should not return leaving a page frame from the
previous kernel mapped.

Signed-off-by: Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp>
Acked-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/x86/kernel/crash_dump_32.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/crash_dump_32.c b/arch/x86/kernel/crash_dump_32.c
index 32e75d0731a9..72d0c56c1b48 100644
--- a/arch/x86/kernel/crash_dump_32.c
+++ b/arch/x86/kernel/crash_dump_32.c
@@ -47,6 +47,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 		if (!kdump_buf_page) {
 			printk(KERN_WARNING "Kdump: Kdump buffer page not"
 				" allocated\n");
+			kunmap_atomic(vaddr, KM_PTE0);
 			return -EFAULT;
 		}
 		copy_page(kdump_buf_page, vaddr);
-- 
2.30.2