linux-kernel - [patch] x86, efi: fix pointer math issue in handle

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Message-ID: <20120302190128.GC3951@elgon.mountain>
Date:	Fri, 2 Mar 2012 22:01:28 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Matt Fleming <matt.fleming@...el.com>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] x86, efi: fix pointer math issue in handle_ramdisks()

"filename" is a efi_char16_t string so this check for reaching the end
of the array doesn't work.  We need to cast it to char pointer before
doing the math.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index fec216f..cf4cdb7 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -559,7 +559,7 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
 			str++;
 
 		while (*str && *str != ' ' && *str != '\n') {
-			if (p >= filename + sizeof(filename))
+			if ((char *)p >= (char *)filename + sizeof(filename))
 				break;
 
 			*p++ = *str++;
--
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