[PATCH] kmap leak fix for x86_32 kdump

[fernando@xxxxxxxxxxxxx (Fernando Luis Vázquez Cao)]

copy_oldmem_page should not return leaving a page frame from the
previous kernel mapped.

Signed-off-by: Fernando Luis Vazquez Cao <fernando at oss.ntt.co.jp>
---

diff -urNp linux-2.6.23-git13-orig/arch/x86/kernel/crash_dump_32.c linux-2.6.23-git13/arch/x86/kernel/crash_dump_32.c
--- linux-2.6.23-git13-orig/arch/x86/kernel/crash_dump_32.c	2007-10-18 19:42:54.000000000 +0900
+++ linux-2.6.23-git13/arch/x86/kernel/crash_dump_32.c	2007-10-18 19:49:25.000000000 +0900
@@ -47,6 +47,7 @@ ssize_t copy_oldmem_page(unsigned long p
 		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);