diff --git a/arch/x86/kernel/crash_dump_32.c b/arch/x86/kernel/crash_dump_32.c
index 32e75d0731a901681c118fb073944992a082fa1c..72d0c56c1b48eff12779b557a75f3aee376c5571 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);