From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Date: Wed, 28 Mar 2012 21:42:47 +0000 (-0700)
Subject: kexec: add further check to crashkernel
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=eaa3be6add6f327ab0a633e4fee8e6f2cc8c8a4c;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

kexec: add further check to crashkernel

When using crashkernel=2M-256M, the kernel doesn't give any warning.  This
is misleading sometimes.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 769e347c5196..3288c9b29bae 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1359,6 +1359,10 @@ static int __init parse_crashkernel_simple(char 		*cmdline,
 
 	if (*cur == '@')
 		*crash_base = memparse(cur+1, &cur);
+	else if (*cur != ' ' && *cur != '\0') {
+		pr_warning("crashkernel: unrecognized char\n");
+		return -EINVAL;
+	}
 
 	return 0;
 }