[PATCH] [190/275] x86: Fix panic when handling "mem={invalid}" param

[Andi Kleen]

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Kamal Mostafa <kamal@xxxxxxxxxxxxx>

commit 77eed821accf5dd962b1f13bed0680e217e49112 upstream.

Avoid removing all of memory and panicing when "mem={invalid}"
is specified, e.g. mem=blahblah, mem=0, or mem=nopentium (on
platforms other than x86_32).

Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
BugLink: http://bugs.launchpad.net/bugs/553464
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
LKML-Reference: <1296783486-23033-1-git-send-email-kamal@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/x86/kernel/e820.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.35.y/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.35.y.orig/arch/x86/kernel/e820.c	2011-03-29 22:50:45.435095848 -0700
+++ linux-2.6.35.y/arch/x86/kernel/e820.c	2011-03-29 23:54:16.526579552 -0700
@@ -989,6 +989,9 @@
 
 	userdef = 1;
 	mem_size = memparse(p, &p);
+	/* don't remove all of memory when handling "mem={invalid}" param */
+	if (mem_size == 0)
+		return -EINVAL;
 	e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
 
 	return 0;
--
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